21977112 has 32 divisors (see below), whose sum is σ = 56430000. Its totient is φ = 7127424.

The previous prime is 21977101. The next prime is 21977113. The reversal of 21977112 is 21177912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21977112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21977113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11487 + ... + 13262.

Almost surely, 2^21977112 is an apocalyptic number.

It is an amenable number.

21977112 is an abundant number, since it is smaller than the sum of its proper divisors (34452888).

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

21977112 is a wasteful number, since it uses less digits than its factorization.

21977112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24795 (or 24791 counting only the distinct ones).

The product of its digits is 1764, while the sum is 30.

The square root of 21977112 is about 4687.9752559074. The cubic root of 21977112 is about 280.1067280206.

The spelling of 21977112 in words is "twenty-one million, nine hundred seventy-seven thousand, one hundred twelve".