21413251216 has 20 divisors (see below), whose sum is σ = 47415056512. Its totient is φ = 9177107616.

The previous prime is 21413251207. The next prime is 21413251253. The reversal of 21413251216 is 61215231412.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 95594760 + ... + 95594983.

Almost surely, 2^21413251216 is an apocalyptic number.

It is an amenable number.

21413251216 is an abundant number, since it is smaller than the sum of its proper divisors (26001805296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21413251216 is a wasteful number, since it uses less digits than its factorization.

21413251216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191189758 (or 191189752 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

Adding to 21413251216 its reverse (61215231412), we get a palindrome (82628482628).

The spelling of 21413251216 in words is "twenty-one billion, four hundred thirteen million, two hundred fifty-one thousand, two hundred sixteen".