21086240790 has 32 divisors (see below), whose sum is σ = 50623175520. Its totient is φ = 5621197824.

The previous prime is 21086240789. The next prime is 21086240803. The reversal of 21086240790 is 9704268012.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15829 + ... + 205968.

It is an arithmetic number, because the mean of its divisors is an integer number (1581974235).

Almost surely, 2^21086240790 is an apocalyptic number.

21086240790 is an abundant number, since it is smaller than the sum of its proper divisors (29536934730).

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

21086240790 is a wasteful number, since it uses less digits than its factorization.

21086240790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224976.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 21086240790 in words is "twenty-one billion, eighty-six million, two hundred forty thousand, seven hundred ninety".