21002412052 has 12 divisors (see below), whose sum is σ = 38688653920. Its totient is φ = 9948510936.

The previous prime is 21002412037. The next prime is 21002412059. The reversal of 21002412052 is 25021420012.

It is a super-2 number, since 2×21002412052² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002412059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138173688 + ... + 138173839.

Almost surely, 2^21002412052 is an apocalyptic number.

It is an amenable number.

21002412052 is a deficient number, since it is larger than the sum of its proper divisors (17686241868).

21002412052 is a wasteful number, since it uses less digits than its factorization.

21002412052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276347550 (or 276347548 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 21002412052 its reverse (25021420012), we get a palindrome (46023832064).

The spelling of 21002412052 in words is "twenty-one billion, two million, four hundred twelve thousand, fifty-two".