21946864912 has 20 divisors (see below), whose sum is σ = 48596629696. Its totient is φ = 9405799200.

The previous prime is 21946864903. The next prime is 21946864913.

21946864912 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21946864912.

It is not an unprimeable number, because it can be changed into a prime (21946864913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97976964 + ... + 97977187.

Almost surely, 2^21946864912 is an apocalyptic number.

It is an amenable number.

21946864912 is an abundant number, since it is smaller than the sum of its proper divisors (26649764784).

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

21946864912 is a wasteful number, since it uses less digits than its factorization.

21946864912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195954166 (or 195954160 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The spelling of 21946864912 in words is "twenty-one billion, nine hundred forty-six million, eight hundred sixty-four thousand, nine hundred twelve".