21179056 has 10 divisors (see below), whose sum is σ = 41034452. Its totient is φ = 10589520.

The previous prime is 21179051. The next prime is 21179069. The reversal of 21179056 is 65097112.

It is a super-2 number, since 2×21179056² = 897104826102272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21179051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661830 + ... + 661861.

Almost surely, 2^21179056 is an apocalyptic number.

It is an amenable number.

21179056 is a deficient number, since it is larger than the sum of its proper divisors (19855396).

21179056 is a wasteful number, since it uses less digits than its factorization.

21179056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323699 (or 1323693 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 21179056 is about 4602.0708382206. The cubic root of 21179056 is about 276.6743295566.

The spelling of 21179056 in words is "twenty-one million, one hundred seventy-nine thousand, fifty-six".