21086374 has 16 divisors (see below), whose sum is σ = 32977008. Its totient is φ = 10102752.

The previous prime is 21086347. The next prime is 21086381. The reversal of 21086374 is 47368012.

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, 2832 + ... + 7084.

It is an arithmetic number, because the mean of its divisors is an integer number (2061063).

Almost surely, 2^21086374 is an apocalyptic number.

21086374 is a deficient number, since it is larger than the sum of its proper divisors (11890634).

21086374 is a wasteful number, since it uses less digits than its factorization.

21086374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4359.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21086374 is about 4591.9902003380. The cubic root of 21086374 is about 276.2701531130.

The spelling of 21086374 in words is "twenty-one million, eighty-six thousand, three hundred seventy-four".