21423425157724 has 6 divisors (see below), whose sum is σ = 37490994026024. Its totient is φ = 10711712578860.

The previous prime is 21423425157677. The next prime is 21423425157731. The reversal of 21423425157724 is 42775152432412.

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, 2677928144712 + ... + 2677928144719.

Almost surely, 2^{21423425157724} is an apocalyptic number.

It is an amenable number.

21423425157724 is a deficient number, since it is larger than the sum of its proper divisors (16067568868300).

21423425157724 is a wasteful number, since it uses less digits than its factorization.

21423425157724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355856289435 (or 5355856289433 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 49.

The spelling of 21423425157724 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-five million, one hundred fifty-seven thousand, seven hundred twenty-four".