21390022794 has 32 divisors (see below), whose sum is σ = 49480542720. Its totient is φ = 6037802352.

The previous prime is 21390022789. The next prime is 21390022807. The reversal of 21390022794 is 49722009312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3064504 + ... + 3071475.

It is an arithmetic number, because the mean of its divisors is an integer number (1546266960).

Almost surely, 2^21390022794 is an apocalyptic number.

21390022794 is an abundant number, since it is smaller than the sum of its proper divisors (28090519926).

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

21390022794 is a wasteful number, since it uses less digits than its factorization.

21390022794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6136074.

The product of its (nonzero) digits is 54432, while the sum is 39.

The spelling of 21390022794 in words is "twenty-one billion, three hundred ninety million, twenty-two thousand, seven hundred ninety-four".