21438122793292 has 12 divisors (see below), whose sum is σ = 37518145533400. Its totient is φ = 10718652640896.

The previous prime is 21438122793253. The next prime is 21438122793331. The reversal of 21438122793292 is 29239722183412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21438122793253) and next prime (21438122793331).

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102070917 + ... + 102280732.

Almost surely, 2^{21438122793292} is an apocalyptic number.

It is an amenable number.

21438122793292 is a deficient number, since it is larger than the sum of its proper divisors (16080022740108).

21438122793292 is a wasteful number, since it uses less digits than its factorization.

21438122793292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204377880 (or 204377878 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The spelling of 21438122793292 in words is "twenty-one trillion, four hundred thirty-eight billion, one hundred twenty-two million, seven hundred ninety-three thousand, two hundred ninety-two".