21232070272 has 64 divisors (see below), whose sum is σ = 49369501440. Its totient is φ = 8905835520.

The previous prime is 21232070267. The next prime is 21232070309. The reversal of 21232070272 is 27207023212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21232070272.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209979 + ... + 294202.

It is an arithmetic number, because the mean of its divisors is an integer number (771398460).

Almost surely, 2^21232070272 is an apocalyptic number.

It is an amenable number.

21232070272 is an abundant number, since it is smaller than the sum of its proper divisors (28137431168).

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

21232070272 is an equidigital number, since it uses as much as digits as its factorization.

21232070272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504249 (or 504237 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

Adding to 21232070272 its reverse (27207023212), we get a palindrome (48439093484).

The spelling of 21232070272 in words is "twenty-one billion, two hundred thirty-two million, seventy thousand, two hundred seventy-two".