2155020000 has 360 divisors, whose sum is σ = 8234220456. Its totient is φ = 491904000.

The previous prime is 2155019989. The next prime is 2155020013. The reversal of 2155020000 is 205512.

It is a super-2 number, since 2×2155020000² = 9288222400800000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2939634 + ... + 2940366.

Almost surely, 2^2155020000 is an apocalyptic number.

2155020000 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 2155020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4117110228).

2155020000 is an abundant number, since it is smaller than the sum of its proper divisors (6079200456).

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

2155020000 is an equidigital number, since it uses as much as digits as its factorization.

2155020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 2155020000 is about 46422.1929684499. The cubic root of 2155020000 is about 1291.6666157937. Note that the first 4 decimals are identical.

Adding to 2155020000 its reverse (205512), we get a palindrome (2155225512).

The spelling of 2155020000 in words is "two billion, one hundred fifty-five million, twenty thousand".