21232404052 has 6 divisors (see below), whose sum is σ = 37156707098. Its totient is φ = 10616202024.

The previous prime is 21232404049. The next prime is 21232404131. The reversal of 21232404052 is 25040423212.

It can be written as a sum of positive squares in only one way, i.e., 11161077316 + 10071326736 = 105646^2 + 100356^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2654050503 + ... + 2654050510.

Almost surely, 2^21232404052 is an apocalyptic number.

It is an amenable number.

21232404052 is a deficient number, since it is larger than the sum of its proper divisors (15924303046).

21232404052 is a wasteful number, since it uses less digits than its factorization.

21232404052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5308101017 (or 5308101015 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21232404052 its reverse (25040423212), we get a palindrome (46272827264).

The spelling of 21232404052 in words is "twenty-one billion, two hundred thirty-two million, four hundred four thousand, fifty-two".