21076530 has 16 divisors (see below), whose sum is σ = 50583744. Its totient is φ = 5620400.

The previous prime is 21076513. The next prime is 21076541. The reversal of 21076530 is 3567012.

It is a self number, because there is not a number n which added to its sum of digits gives 21076530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351246 + ... + 351305.

It is an arithmetic number, because the mean of its divisors is an integer number (3161484).

Almost surely, 2^21076530 is an apocalyptic number.

21076530 is an abundant number, since it is smaller than the sum of its proper divisors (29507214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21076530 is a wasteful number, since it uses less digits than its factorization.

21076530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702561.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 21076530 is about 4590.9182088118. The cubic root of 21076530 is about 276.2271549395.

The spelling of 21076530 in words is "twenty-one million, seventy-six thousand, five hundred thirty".