21634677 has 12 divisors (see below), whose sum is σ = 32095180. Its totient is φ = 14033088.

The previous prime is 21634663. The next prime is 21634699. The reversal of 21634677 is 77643612.

It can be written as a sum of positive squares in 2 ways, for example, as 11655396 + 9979281 = 3414^2 + 3159^2 .

It is not a de Polignac number, because 21634677 - 2⁴ = 21634661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32152 + ... + 32817.

Almost surely, 2^21634677 is an apocalyptic number.

It is an amenable number.

21634677 is a deficient number, since it is larger than the sum of its proper divisors (10460503).

21634677 is a wasteful number, since it uses less digits than its factorization.

21634677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65012 (or 65009 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 21634677 is about 4651.3091705454. The cubic root of 21634677 is about 278.6442840156.

The spelling of 21634677 in words is "twenty-one million, six hundred thirty-four thousand, six hundred seventy-seven".