21275357 has 8 divisors (see below), whose sum is σ = 22080000. Its totient is φ = 20475504.

The previous prime is 21275329. The next prime is 21275369. The reversal of 21275357 is 75357212.

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 21275357 - 2¹⁴ = 21258973 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 (21275327) 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, 9644 + ... + 11642.

It is an arithmetic number, because the mean of its divisors is an integer number (2760000).

Almost surely, 2^21275357 is an apocalyptic number.

It is an amenable number.

21275357 is a deficient number, since it is larger than the sum of its proper divisors (804643).

21275357 is a wasteful number, since it uses less digits than its factorization.

21275357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395.

The product of its digits is 14700, while the sum is 32.

The square root of 21275357 is about 4612.5217614663. The cubic root of 21275357 is about 277.0930408996.

The spelling of 21275357 in words is "twenty-one million, two hundred seventy-five thousand, three hundred fifty-seven".