2143221320000 has 140 divisors (see below), whose sum is σ = 5315945118660. Its totient is φ = 857054208000.

The previous prime is 2143221319961. The next prime is 2143221320027. The reversal of 2143221320000 is 231223412.

It can be written as a sum of positive squares in 10 ways, for example, as 1992795248896 + 150426071104 = 1411664^2 + 387848^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 284356232 + ... + 284363768.

Almost surely, 2^{2143221320000} is an apocalyptic number.

2143221320000 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 2143221320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2657972559330).

2143221320000 is an abundant number, since it is smaller than the sum of its proper divisors (3172723798660).

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

2143221320000 is an frugal number, since it uses more digits than its factorization.

2143221320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14678 (or 14653 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 2143221320000 its reverse (231223412), we get a palindrome (2143452543412).

The spelling of 2143221320000 in words is "two trillion, one hundred forty-three billion, two hundred twenty-one million, three hundred twenty thousand".