21939992895743 has 16 divisors (see below), whose sum is σ = 24891583610880. Its totient is φ = 19170702311904.

The previous prime is 21939992895719. The next prime is 21939992895757. The reversal of 21939992895743 is 34759829993912.

It is not a de Polignac number, because 21939992895743 - 2²⁰ = 21939991847167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21939992895713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36012671 + ... + 36616832.

It is an arithmetic number, because the mean of its divisors is an integer number (1555723975680).

Almost surely, 2^{21939992895743} is an apocalyptic number.

21939992895743 is a deficient number, since it is larger than the sum of its proper divisors (2951590715137).

21939992895743 is a wasteful number, since it uses less digits than its factorization.

21939992895743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72630758.

The product of its digits is 2380855680, while the sum is 80.

The spelling of 21939992895743 in words is "twenty-one trillion, nine hundred thirty-nine billion, nine hundred ninety-two million, eight hundred ninety-five thousand, seven hundred forty-three".