21672710 has 16 divisors (see below), whose sum is σ = 39414816. Its totient is φ = 8579328.

The previous prime is 21672649. The next prime is 21672719. The reversal of 21672710 is 1727612.

It is a self number, because there is not a number n which added to its sum of digits gives 21672710.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21672719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10202 + ... + 12141.

It is an arithmetic number, because the mean of its divisors is an integer number (2463426).

Almost surely, 2^21672710 is an apocalyptic number.

21672710 is a deficient number, since it is larger than the sum of its proper divisors (17742106).

21672710 is a wasteful number, since it uses less digits than its factorization.

21672710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22447.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 21672710 is about 4655.3957941296. The cubic root of 21672710 is about 278.8074707057.

The spelling of 21672710 in words is "twenty-one million, six hundred seventy-two thousand, seven hundred ten".