21994849912 has 24 divisors (see below), whose sum is σ = 47973461760. Its totient is φ = 9426364080.

The previous prime is 21994849889. The next prime is 21994849913.

21994849912 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21994849913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28054264 + ... + 28055047.

It is an arithmetic number, because the mean of its divisors is an integer number (1998894240).

Almost surely, 2^21994849912 is an apocalyptic number.

It is an amenable number.

21994849912 is an abundant number, since it is smaller than the sum of its proper divisors (25978611848).

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

21994849912 is a wasteful number, since it uses less digits than its factorization.

21994849912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56109331 (or 56109320 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 58.

The spelling of 21994849912 in words is "twenty-one billion, nine hundred ninety-four million, eight hundred forty-nine thousand, nine hundred twelve".