21264166112 has 48 divisors (see below), whose sum is σ = 48130951680. Its totient is φ = 9058627968.

The previous prime is 21264166111. The next prime is 21264166123. The reversal of 21264166112 is 21166146212.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21264166111) 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, 246812 + ... + 321627.

It is an arithmetic number, because the mean of its divisors is an integer number (1002728160).

Almost surely, 2^21264166112 is an apocalyptic number.

It is an amenable number.

21264166112 is an abundant number, since it is smaller than the sum of its proper divisors (26866785568).

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

21264166112 is a wasteful number, since it uses less digits than its factorization.

21264166112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568623 (or 568615 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The spelling of 21264166112 in words is "twenty-one billion, two hundred sixty-four million, one hundred sixty-six thousand, one hundred twelve".