21060808 has 8 divisors (see below), whose sum is σ = 39489030. Its totient is φ = 10530400.

The previous prime is 21060763. The next prime is 21060829. The reversal of 21060808 is 80806012.

It can be written as a sum of positive squares in only one way, i.e., 18507204 + 2553604 = 4302^2 + 1598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21060808² = 887115267225728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1316293 + ... + 1316308.

Almost surely, 2^21060808 is an apocalyptic number.

It is an amenable number.

21060808 is a deficient number, since it is larger than the sum of its proper divisors (18428222).

21060808 is a wasteful number, since it uses less digits than its factorization.

21060808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632607 (or 2632603 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 21060808 is about 4589.2055957431. The cubic root of 21060808 is about 276.1584541362.

The spelling of 21060808 in words is "twenty-one million, sixty thousand, eight hundred eight".