21969433794 has 32 divisors (see below), whose sum is σ = 54780926976. Its totient is φ = 5706346320.

The previous prime is 21969433781. The next prime is 21969433813. The reversal of 21969433794 is 49733496912.

It is a happy number.

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, 23775982 + ... + 23776905.

It is an arithmetic number, because the mean of its divisors is an integer number (1711903968).

Almost surely, 2^21969433794 is an apocalyptic number.

21969433794 is an abundant number, since it is smaller than the sum of its proper divisors (32811493182).

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

21969433794 is a wasteful number, since it uses less digits than its factorization.

21969433794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47552910.

The product of its digits is 8817984, while the sum is 57.

The spelling of 21969433794 in words is "twenty-one billion, nine hundred sixty-nine million, four hundred thirty-three thousand, seven hundred ninety-four".