2155102400 has 84 divisors (see below), whose sum is σ = 5785027800. Its totient is φ = 783667200.

The previous prime is 2155102399. The next prime is 2155102403. The reversal of 2155102400 is 42015512.

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

It is not an unprimeable number, because it can be changed into a prime (2155102403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43625 + ... + 78824.

Almost surely, 2^2155102400 is an apocalyptic number.

2155102400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155102400 is an abundant number, since it is smaller than the sum of its proper divisors (3629925400).

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

2155102400 is a wasteful number, since it uses less digits than its factorization.

2155102400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122482 (or 122467 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 2155102400 is about 46423.0804665093. The cubic root of 2155102400 is about 1291.6830784364.

Adding to 2155102400 its reverse (42015512), we get a palindrome (2197117912).

The spelling of 2155102400 in words is "two billion, one hundred fifty-five million, one hundred two thousand, four hundred".