21516914 has 32 divisors (see below), whose sum is σ = 35389440. Its totient is φ = 9781200.

The previous prime is 21516893. The next prime is 21516919. The reversal of 21516914 is 41961512.

It is not an unprimeable number, because it can be changed into a prime (21516919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112559 + ... + 112749.

It is an arithmetic number, because the mean of its divisors is an integer number (1105920).

Almost surely, 2^21516914 is an apocalyptic number.

21516914 is a deficient number, since it is larger than the sum of its proper divisors (13872526).

21516914 is a wasteful number, since it uses less digits than its factorization.

21516914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326.

The product of its digits is 2160, while the sum is 29.

The square root of 21516914 is about 4638.6327727036. The cubic root of 21516914 is about 278.1377868800.

The spelling of 21516914 in words is "twenty-one million, five hundred sixteen thousand, nine hundred fourteen".