21031204032 has 84 divisors (see below), whose sum is σ = 60317000016. Its totient is φ = 7006348800.

The previous prime is 21031204031. The next prime is 21031204037. The reversal of 21031204032 is 23040213012.

21031204032 is a `hidden beast` number, since 210 + 31 + 20 + 403 + 2 = 666.

It is a super-2 number, since 2×21031204032² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21031203996 and 21031204014.

It is not an unprimeable number, because it can be changed into a prime (21031204031) 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, 1085373 + ... + 1104579.

It is an arithmetic number, because the mean of its divisors is an integer number (718059524).

Almost surely, 2^21031204032 is an apocalyptic number.

It is an amenable number.

21031204032 is an abundant number, since it is smaller than the sum of its proper divisors (39285795984).

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

21031204032 is a wasteful number, since it uses less digits than its factorization.

21031204032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21126 (or 21113 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21031204032 its reverse (23040213012), we get a palindrome (44071417044).

The spelling of 21031204032 in words is "twenty-one billion, thirty-one million, two hundred four thousand, thirty-two".