21155200152 has 64 divisors (see below), whose sum is σ = 54007351680. Its totient is φ = 6903781632.

The previous prime is 21155200147. The next prime is 21155200177. The reversal of 21155200152 is 25100255112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221748 + ... + 302460.

It is an arithmetic number, because the mean of its divisors is an integer number (843864870).

Almost surely, 2^21155200152 is an apocalyptic number.

It is an amenable number.

21155200152 is an abundant number, since it is smaller than the sum of its proper divisors (32852151528).

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

21155200152 is a wasteful number, since it uses less digits than its factorization.

21155200152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80952 (or 80948 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

Adding to 21155200152 its reverse (25100255112), we get a palindrome (46255455264).

The spelling of 21155200152 in words is "twenty-one billion, one hundred fifty-five million, two hundred thousand, one hundred fifty-two".