21274757 has 8 divisors (see below), whose sum is σ = 24416832. Its totient is φ = 18158400.

The previous prime is 21274739. The next prime is 21274763. The reversal of 21274757 is 75747212.

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

It is a cyclic number.

It is not a de Polignac number, because 21274757 - 2¹⁴ = 21258373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21274727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4619 + ... + 7992.

It is an arithmetic number, because the mean of its divisors is an integer number (3052104).

Almost surely, 2^21274757 is an apocalyptic number.

It is an amenable number.

21274757 is a deficient number, since it is larger than the sum of its proper divisors (3142075).

21274757 is a wasteful number, since it uses less digits than its factorization.

21274757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12859.

The product of its digits is 27440, while the sum is 35.

The square root of 21274757 is about 4612.4567206642. The cubic root of 21274757 is about 277.0904360489.

The spelling of 21274757 in words is "twenty-one million, two hundred seventy-four thousand, seven hundred fifty-seven".