21566348 has 6 divisors (see below), whose sum is σ = 37741116. Its totient is φ = 10783172.

The previous prime is 21566339. The next prime is 21566351. The reversal of 21566348 is 84366512.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2695790 + ... + 2695797.

It is an arithmetic number, because the mean of its divisors is an integer number (6290186).

Almost surely, 2^21566348 is an apocalyptic number.

It is an amenable number.

21566348 is a deficient number, since it is larger than the sum of its proper divisors (16174768).

21566348 is a wasteful number, since it uses less digits than its factorization.

21566348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5391591 (or 5391589 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 21566348 is about 4643.9582254796. The cubic root of 21566348 is about 278.3506263732.

The spelling of 21566348 in words is "twenty-one million, five hundred sixty-six thousand, three hundred forty-eight".