21274718 has 16 divisors (see below), whose sum is σ = 35568720. Its totient is φ = 9484416.

The previous prime is 21274709. The next prime is 21274727. The reversal of 21274718 is 81747212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21274709) and next prime (21274727).

It is a super-2 number, since 2×21274718² = 905227251959048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15821 + ... + 17112.

It is an arithmetic number, because the mean of its divisors is an integer number (2223045).

Almost surely, 2^21274718 is an apocalyptic number.

21274718 is a deficient number, since it is larger than the sum of its proper divisors (14294002).

21274718 is a wasteful number, since it uses less digits than its factorization.

21274718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32971.

The product of its digits is 6272, while the sum is 32.

The square root of 21274718 is about 4612.4524929803. The cubic root of 21274718 is about 277.0902667319.

The spelling of 21274718 in words is "twenty-one million, two hundred seventy-four thousand, seven hundred eighteen".