21117058 has 4 divisors (see below), whose sum is σ = 31675590. Its totient is φ = 10558528.

The previous prime is 21117049. The next prime is 21117067. The reversal of 21117058 is 85071112.

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

It is an interprime number because it is at equal distance from previous prime (21117049) and next prime (21117067).

It can be written as a sum of positive squares in only one way, i.e., 11175649 + 9941409 = 3343^2 + 3153^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5279263 + ... + 5279266.

Almost surely, 2^21117058 is an apocalyptic number.

21117058 is a deficient number, since it is larger than the sum of its proper divisors (10558532).

21117058 is a wasteful number, since it uses less digits than its factorization.

21117058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10558531.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 21117058 is about 4595.3300207928. The cubic root of 21117058 is about 276.4040937148.

The spelling of 21117058 in words is "twenty-one million, one hundred seventeen thousand, fifty-eight".