21756014 has 16 divisors (see below), whose sum is σ = 37929600. Its totient is φ = 9165624.

The previous prime is 21755959. The next prime is 21756041. The reversal of 21756014 is 41065712.

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, 12344 + ... + 13995.

It is an arithmetic number, because the mean of its divisors is an integer number (2370600).

Almost surely, 2^21756014 is an apocalyptic number.

21756014 is a deficient number, since it is larger than the sum of its proper divisors (16173586).

21756014 is a wasteful number, since it uses less digits than its factorization.

21756014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26407.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21756014 is about 4664.3342504585. The cubic root of 21756014 is about 279.1642340126.

The spelling of 21756014 in words is "twenty-one million, seven hundred fifty-six thousand, fourteen".