21672534 has 32 divisors (see below), whose sum is σ = 48190464. Its totient is φ = 6452640.

The previous prime is 21672527. The next prime is 21672571. The reversal of 21672534 is 43527612.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2064 + ... + 6899.

It is an arithmetic number, because the mean of its divisors is an integer number (1505952).

Almost surely, 2^21672534 is an apocalyptic number.

21672534 is an abundant number, since it is smaller than the sum of its proper divisors (26517930).

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

21672534 is a wasteful number, since it uses less digits than its factorization.

21672534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9012.

The product of its digits is 10080, while the sum is 30.

The square root of 21672534 is about 4655.3768912946. The cubic root of 21672534 is about 278.8067159894.

The spelling of 21672534 in words is "twenty-one million, six hundred seventy-two thousand, five hundred thirty-four".