21324957 has 8 divisors (see below), whose sum is σ = 28459200. Its totient is φ = 14203680.

The previous prime is 21324949. The next prime is 21324971. The reversal of 21324957 is 75942312.

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

It is not a de Polignac number, because 21324957 - 2³ = 21324949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324937) 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, 1657 + ... + 6737.

It is an arithmetic number, because the mean of its divisors is an integer number (3557400).

Almost surely, 2^21324957 is an apocalyptic number.

It is an amenable number.

21324957 is a deficient number, since it is larger than the sum of its proper divisors (7134243).

21324957 is a wasteful number, since it uses less digits than its factorization.

21324957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6483.

The product of its digits is 15120, while the sum is 33.

The square root of 21324957 is about 4617.8952998092. The cubic root of 21324957 is about 277.3082060812.

The spelling of 21324957 in words is "twenty-one million, three hundred twenty-four thousand, nine hundred fifty-seven".