21204232152 has 16 divisors (see below), whose sum is σ = 53010580440. Its totient is φ = 7068077376.

The previous prime is 21204232099. The next prime is 21204232157. The reversal of 21204232152 is 25123240212.

It is a super-2 number, since 2×21204232152² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 883509673 = 21204232152 / (2 + 1 + 2 + 0 + 4 + 2 + 3 + 2 + 1 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204232157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441754813 + ... + 441754860.

Almost surely, 2^21204232152 is an apocalyptic number.

It is an amenable number.

21204232152 is an abundant number, since it is smaller than the sum of its proper divisors (31806348288).

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

21204232152 is a wasteful number, since it uses less digits than its factorization.

21204232152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883509682 (or 883509678 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21204232152 its reverse (25123240212), we get a palindrome (46327472364).

The spelling of 21204232152 in words is "twenty-one billion, two hundred four million, two hundred thirty-two thousand, one hundred fifty-two".