21117962 has 4 divisors (see below), whose sum is σ = 31676946. Its totient is φ = 10558980.

The previous prime is 21117959. The next prime is 21117983. The reversal of 21117962 is 26971112.

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., 18156121 + 2961841 = 4261^2 + 1721^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5279489 + ... + 5279492.

Almost surely, 2^21117962 is an apocalyptic number.

21117962 is a deficient number, since it is larger than the sum of its proper divisors (10558984).

21117962 is a wasteful number, since it uses less digits than its factorization.

21117962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10558983.

The product of its digits is 1512, while the sum is 29.

The square root of 21117962 is about 4595.4283804668. The cubic root of 21117962 is about 276.4080378522.

The spelling of 21117962 in words is "twenty-one million, one hundred seventeen thousand, nine hundred sixty-two".