21201031232 has 14 divisors (see below), whose sum is σ = 42070796478. Its totient is φ = 10600515584.

The previous prime is 21201031207. The next prime is 21201031249. The reversal of 21201031232 is 23213010212.

It can be written as a sum of positive squares in only one way, i.e., 19842666496 + 1358364736 = 140864^2 + 36856^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21201031232.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165632993 + ... + 165633120.

Almost surely, 2^21201031232 is an apocalyptic number.

It is an amenable number.

21201031232 is a deficient number, since it is larger than the sum of its proper divisors (20869765246).

21201031232 is an equidigital number, since it uses as much as digits as its factorization.

21201031232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331266125 (or 331266115 counting only the distinct ones).

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

Adding to 21201031232 its reverse (23213010212), we get a palindrome (44414041444).

The spelling of 21201031232 in words is "twenty-one billion, two hundred one million, thirty-one thousand, two hundred thirty-two".