21973677 has 16 divisors (see below), whose sum is σ = 33065280. Its totient is φ = 12857600.

The previous prime is 21973649. The next prime is 21973681. The reversal of 21973677 is 77637912.

It is a cyclic number.

It is not a de Polignac number, because 21973677 - 2¹¹ = 21971629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21973607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10524 + ... + 12437.

It is an arithmetic number, because the mean of its divisors is an integer number (2066580).

Almost surely, 2^21973677 is an apocalyptic number.

It is an amenable number.

21973677 is a deficient number, since it is larger than the sum of its proper divisors (11091603).

21973677 is a wasteful number, since it uses less digits than its factorization.

21973677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23004.

The product of its digits is 111132, while the sum is 42.

The square root of 21973677 is about 4687.6088787355. The cubic root of 21973677 is about 280.0921337958.

The spelling of 21973677 in words is "twenty-one million, nine hundred seventy-three thousand, six hundred seventy-seven".