21332930 has 8 divisors (see below), whose sum is σ = 38399292. Its totient is φ = 8533168.

The previous prime is 21332921. The next prime is 21332939. The reversal of 21332930 is 3923312.

It is an interprime number because it is at equal distance from previous prime (21332921) and next prime (21332939).

It can be written as a sum of positive squares in 2 ways, for example, as 20675209 + 657721 = 4547^2 + 811^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21332896 and 21332905.

It is not an unprimeable number, because it can be changed into a prime (21332939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066637 + ... + 1066656.

Almost surely, 2^21332930 is an apocalyptic number.

21332930 is a deficient number, since it is larger than the sum of its proper divisors (17066362).

21332930 is a wasteful number, since it uses less digits than its factorization.

21332930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133300.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 21332930 is about 4618.7584911965. The cubic root of 21332930 is about 277.3427618810.

The spelling of 21332930 in words is "twenty-one million, three hundred thirty-two thousand, nine hundred thirty".