2156220000 has 600 divisors, whose sum is σ = 8716016232. Its totient is φ = 522720000.

The previous prime is 2156219981. The next prime is 2156220019. The reversal of 2156220000 is 226512.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (2156219981) and next prime (2156220019).

It is a tau number, because it is divible by the number of its divisors (600).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 1650 × 990 × 1320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 196019995 + ... + 196020005.

Almost surely, 2^2156220000 is an apocalyptic number.

2156220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4358008116).

2156220000 is an abundant number, since it is smaller than the sum of its proper divisors (6559796232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156220000 is an frugal number, since it uses more digits than its factorization.

2156220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2156220000 is about 46435.1160222520. The cubic root of 2156220000 is about 1291.9063215857.

Adding to 2156220000 its reverse (226512), we get a palindrome (2156446512).

The spelling of 2156220000 in words is "two billion, one hundred fifty-six million, two hundred twenty thousand".