21315424052 has 12 divisors (see below), whose sum is σ = 40171376196. Its totient is φ = 9837888000.

The previous prime is 21315424027. The next prime is 21315424073. The reversal of 21315424052 is 25042451312.

It can be written as a sum of positive squares in 2 ways, for example, as 4883773456 + 16431650596 = 69884^2 + 128186^2 .

It is a congruent number.

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, 204955949 + ... + 204956052.

It is an arithmetic number, because the mean of its divisors is an integer number (3347614683).

Almost surely, 2^21315424052 is an apocalyptic number.

It is an amenable number.

21315424052 is a deficient number, since it is larger than the sum of its proper divisors (18855952144).

21315424052 is a wasteful number, since it uses less digits than its factorization.

21315424052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409912018 (or 409912016 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21315424052 its reverse (25042451312), we get a palindrome (46357875364).

The spelling of 21315424052 in words is "twenty-one billion, three hundred fifteen million, four hundred twenty-four thousand, fifty-two".