21116161612 has 48 divisors (see below), whose sum is σ = 46590288192. Its totient is φ = 8149893120.

The previous prime is 21116161559. The next prime is 21116161667. The reversal of 21116161612 is 21616161112.

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 15 ways as a sum of consecutive naturals, for example, 692533 + ... + 722380.

It is an arithmetic number, because the mean of its divisors is an integer number (970631004).

Almost surely, 2^21116161612 is an apocalyptic number.

It is an amenable number.

21116161612 is an abundant number, since it is smaller than the sum of its proper divisors (25474126580).

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

21116161612 is a wasteful number, since it uses less digits than its factorization.

21116161612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414978 (or 1414976 counting only the distinct ones).

The product of its digits is 864, while the sum is 28.

The spelling of 21116161612 in words is "twenty-one billion, one hundred sixteen million, one hundred sixty-one thousand, six hundred twelve".