21227579916 has 24 divisors (see below), whose sum is σ = 49581744240. Its totient is φ = 7068613632.

The previous prime is 21227579899. The next prime is 21227579951. The reversal of 21227579916 is 61997572212.

It is a super-2 number, since 2×21227579916² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 893581 + ... + 917028.

It is an arithmetic number, because the mean of its divisors is an integer number (2065906010).

Almost surely, 2^21227579916 is an apocalyptic number.

It is an amenable number.

21227579916 is an abundant number, since it is smaller than the sum of its proper divisors (28354164324).

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

21227579916 is a wasteful number, since it uses less digits than its factorization.

21227579916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811593 (or 1811591 counting only the distinct ones).

The product of its digits is 952560, while the sum is 51.

The spelling of 21227579916 in words is "twenty-one billion, two hundred twenty-seven million, five hundred seventy-nine thousand, nine hundred sixteen".