21371910 has 32 divisors (see below), whose sum is σ = 58620672. Its totient is φ = 4884960.

The previous prime is 21371893. The next prime is 21371929. The reversal of 21371910 is 1917312.

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, 50676 + ... + 51095.

It is an arithmetic number, because the mean of its divisors is an integer number (1831896).

Almost surely, 2^21371910 is an apocalyptic number.

21371910 is an abundant number, since it is smaller than the sum of its proper divisors (37248762).

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

21371910 is a wasteful number, since it uses less digits than its factorization.

21371910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101788.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 21371910 is about 4622.9763140211. The cubic root of 21371910 is about 277.5115813688.

The spelling of 21371910 in words is "twenty-one million, three hundred seventy-one thousand, nine hundred ten".