21139076 has 12 divisors (see below), whose sum is σ = 42278208. Its totient is φ = 9059592.

The previous prime is 21139061. The next prime is 21139087. The reversal of 21139076 is 67093112.

21139076 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377456 + ... + 377511.

It is an arithmetic number, because the mean of its divisors is an integer number (3523184).

Almost surely, 2^21139076 is an apocalyptic number.

It is an amenable number.

21139076 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21139076 is a wasteful number, since it uses less digits than its factorization.

21139076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754978 (or 754976 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21139076 is about 4597.7250896503. The cubic root of 21139076 is about 276.5001258955.

The spelling of 21139076 in words is "twenty-one million, one hundred thirty-nine thousand, seventy-six".