21672118 has 16 divisors (see below), whose sum is σ = 36531936. Its totient is φ = 9567360.

The previous prime is 21672109. The next prime is 21672137. The reversal of 21672118 is 81127612.

It is a congruent number.

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, 17523 + ... + 18718.

It is an arithmetic number, because the mean of its divisors is an integer number (2283246).

Almost surely, 2^21672118 is an apocalyptic number.

21672118 is a deficient number, since it is larger than the sum of its proper divisors (14859818).

21672118 is a wasteful number, since it uses less digits than its factorization.

21672118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36279.

The product of its digits is 1344, while the sum is 28.

The square root of 21672118 is about 4655.3322115613. The cubic root of 21672118 is about 278.8049320980.

The spelling of 21672118 in words is "twenty-one million, six hundred seventy-two thousand, one hundred eighteen".