21969964468 has 6 divisors (see below), whose sum is σ = 38447437826. Its totient is φ = 10984982232.

The previous prime is 21969964453. The next prime is 21969964519. The reversal of 21969964468 is 86446996912.

It can be written as a sum of positive squares in only one way, i.e., 21444087844 + 525876624 = 146438^2 + 22932^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2746245555 + ... + 2746245562.

Almost surely, 2^21969964468 is an apocalyptic number.

It is an amenable number.

21969964468 is a deficient number, since it is larger than the sum of its proper divisors (16477473358).

21969964468 is a wasteful number, since it uses less digits than its factorization.

21969964468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5492491121 (or 5492491119 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 64.

The spelling of 21969964468 in words is "twenty-one billion, nine hundred sixty-nine million, nine hundred sixty-four thousand, four hundred sixty-eight".