21031120232 has 16 divisors (see below), whose sum is σ = 40395140100. Its totient is φ = 10259082880.

The previous prime is 21031120211. The next prime is 21031120249. The reversal of 21031120232 is 23202113012.

It can be written as a sum of positive squares in 2 ways, for example, as 18805733956 + 2225386276 = 137134^2 + 47174^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21031120232.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32059307 + ... + 32059962.

Almost surely, 2^21031120232 is an apocalyptic number.

It is an amenable number.

21031120232 is a deficient number, since it is larger than the sum of its proper divisors (19364019868).

21031120232 is a wasteful number, since it uses less digits than its factorization.

21031120232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64119316 (or 64119312 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21031120232 its reverse (23202113012), we get a palindrome (44233233244).

The spelling of 21031120232 in words is "twenty-one billion, thirty-one million, one hundred twenty thousand, two hundred thirty-two".