21332757 has 8 divisors (see below), whose sum is σ = 29212576. Its totient is φ = 13837392.

The previous prime is 21332711. The next prime is 21332761. The reversal of 21332757 is 75723312.

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

It is not a de Polignac number, because 21332757 - 2⁶ = 21332693 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 (21332797) 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, 95983 + ... + 96204.

It is an arithmetic number, because the mean of its divisors is an integer number (3651572).

Almost surely, 2^21332757 is an apocalyptic number.

It is an amenable number.

21332757 is a deficient number, since it is larger than the sum of its proper divisors (7879819).

21332757 is a wasteful number, since it uses less digits than its factorization.

21332757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192227.

The product of its digits is 8820, while the sum is 30.

The square root of 21332757 is about 4618.7397631822. The cubic root of 21332757 is about 277.3420121727.

The spelling of 21332757 in words is "twenty-one million, three hundred thirty-two thousand, seven hundred fifty-seven".