21612914 has 4 divisors (see below), whose sum is σ = 32419374. Its totient is φ = 10806456.

The previous prime is 21612911. The next prime is 21612919. The reversal of 21612914 is 41921612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21464689 + 148225 = 4633^2 + 385^2 .

It is not an unprimeable number, because it can be changed into a prime (21612911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5403227 + ... + 5403230.

Almost surely, 2^21612914 is an apocalyptic number.

21612914 is a deficient number, since it is larger than the sum of its proper divisors (10806460).

21612914 is a wasteful number, since it uses less digits than its factorization.

21612914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806459.

The product of its digits is 864, while the sum is 26.

The square root of 21612914 is about 4648.9691330444. The cubic root of 21612914 is about 278.5508203283.

The spelling of 21612914 in words is "twenty-one million, six hundred twelve thousand, nine hundred fourteen".