21347332 has 6 divisors (see below), whose sum is σ = 37357838. Its totient is φ = 10673664.

The previous prime is 21347329. The next prime is 21347363. The reversal of 21347332 is 23374312.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 8213956 = 3624^2 + 2866^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21347297 and 21347306.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668413 + ... + 2668420.

Almost surely, 2^21347332 is an apocalyptic number.

It is an amenable number.

21347332 is a deficient number, since it is larger than the sum of its proper divisors (16010506).

21347332 is a wasteful number, since it uses less digits than its factorization.

21347332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5336837 (or 5336835 counting only the distinct ones).

The product of its digits is 3024, while the sum is 25.

The square root of 21347332 is about 4620.3173051209. The cubic root of 21347332 is about 277.4051598097.

The spelling of 21347332 in words is "twenty-one million, three hundred forty-seven thousand, three hundred thirty-two".