21332397 has 8 divisors (see below), whose sum is σ = 28478944. Its totient is φ = 14203728.

The previous prime is 21332393. The next prime is 21332401. The reversal of 21332397 is 79323312.

It is an interprime number because it is at equal distance from previous prime (21332393) and next prime (21332401).

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

It is not a de Polignac number, because 21332397 - 2² = 21332393 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 (21332393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1378 + ... + 6675.

It is an arithmetic number, because the mean of its divisors is an integer number (3559868).

Almost surely, 2^21332397 is an apocalyptic number.

It is an amenable number.

21332397 is a deficient number, since it is larger than the sum of its proper divisors (7146547).

21332397 is an equidigital number, since it uses as much as digits as its factorization.

21332397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8939.

The product of its digits is 6804, while the sum is 30.

The square root of 21332397 is about 4618.7007913481. The cubic root of 21332397 is about 277.3404520729.

The spelling of 21332397 in words is "twenty-one million, three hundred thirty-two thousand, three hundred ninety-seven".