21674138 has 16 divisors (see below), whose sum is σ = 33590376. Its totient is φ = 10483200.

The previous prime is 21674129. The next prime is 21674141. The reversal of 21674138 is 83147612.

It can be written as a sum of positive squares in 4 ways, for example, as 20457529 + 1216609 = 4523^2 + 1103^2 .

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, 6338 + ... + 9138.

Almost surely, 2^21674138 is an apocalyptic number.

21674138 is a deficient number, since it is larger than the sum of its proper divisors (11916238).

21674138 is a wasteful number, since it uses less digits than its factorization.

21674138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929.

The product of its digits is 8064, while the sum is 32.

The square root of 21674138 is about 4655.5491620216. The cubic root of 21674138 is about 278.8135940489.

It can be divided in two parts, 21674 and 138, that added together give a palindrome (21812).

The spelling of 21674138 in words is "twenty-one million, six hundred seventy-four thousand, one hundred thirty-eight".