21274958 has 4 divisors (see below), whose sum is σ = 31912440. Its totient is φ = 10637478.

The previous prime is 21274949. The next prime is 21274961. The reversal of 21274958 is 85947212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5318738 + ... + 5318741.

It is an arithmetic number, because the mean of its divisors is an integer number (7978110).

Almost surely, 2^21274958 is an apocalyptic number.

21274958 is a deficient number, since it is larger than the sum of its proper divisors (10637482).

21274958 is a wasteful number, since it uses less digits than its factorization.

21274958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10637481.

The product of its digits is 40320, while the sum is 38.

The square root of 21274958 is about 4612.4785094350. The cubic root of 21274958 is about 277.0913086793.

The spelling of 21274958 in words is "twenty-one million, two hundred seventy-four thousand, nine hundred fifty-eight".