21423424615749 has 96 divisors (see below), whose sum is σ = 35144994044160. Its totient is φ = 12476341177344.

The previous prime is 21423424615661. The next prime is 21423424615771. The reversal of 21423424615749 is 94751642432412.

21423424615749 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 3 + 4 + 2 + 4 + 61 + 574 + 9 = 666.

It is not a de Polignac number, because 21423424615749 - 2²⁰ = 21423423567173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21423424615695 and 21423424615704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423424611749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 200283409 + ... + 200390345.

It is an arithmetic number, because the mean of its divisors is an integer number (366093687960).

Almost surely, 2^{21423424615749} is an apocalyptic number.

It is an amenable number.

21423424615749 is a deficient number, since it is larger than the sum of its proper divisors (13721569428411).

21423424615749 is a wasteful number, since it uses less digits than its factorization.

21423424615749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107771 (or 107768 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 54.

The spelling of 21423424615749 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-four million, six hundred fifteen thousand, seven hundred forty-nine".