21113137316 has 24 divisors (see below), whose sum is σ = 38622999744. Its totient is φ = 10079627360.

The previous prime is 21113137313. The next prime is 21113137319. The reversal of 21113137316 is 61373131112.

It is an interprime number because it is at equal distance from previous prime (21113137313) and next prime (21113137319).

It is not an unprimeable number, because it can be changed into a prime (21113137313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152015 + ... + 255606.

It is an arithmetic number, because the mean of its divisors is an integer number (1609291656).

Almost surely, 2^21113137316 is an apocalyptic number.

It is an amenable number.

21113137316 is a deficient number, since it is larger than the sum of its proper divisors (17509862428).

21113137316 is a wasteful number, since it uses less digits than its factorization.

21113137316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408211 (or 408209 counting only the distinct ones).

The product of its digits is 2268, while the sum is 29.

Adding to 21113137316 its reverse (61373131112), we get a palindrome (82486268428).

The spelling of 21113137316 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-seven thousand, three hundred sixteen".