21274742 has 8 divisors (see below), whose sum is σ = 32941632. Its totient is φ = 10294200.

The previous prime is 21274739. The next prime is 21274763. The reversal of 21274742 is 24747212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21274742² = 905229294333128, 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 3 ways as a sum of consecutive naturals, for example, 171509 + ... + 171632.

It is an arithmetic number, because the mean of its divisors is an integer number (4117704).

Almost surely, 2^21274742 is an apocalyptic number.

21274742 is a deficient number, since it is larger than the sum of its proper divisors (11666890).

21274742 is a wasteful number, since it uses less digits than its factorization.

21274742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343174.

The product of its digits is 6272, while the sum is 29.

The square root of 21274742 is about 4612.4550946324. The cubic root of 21274742 is about 277.0903709270.

The spelling of 21274742 in words is "twenty-one million, two hundred seventy-four thousand, seven hundred forty-two".