21742456037405 has 16 divisors (see below), whose sum is σ = 26626664797824. Its totient is φ = 17039688431040.

The previous prime is 21742456037327. The next prime is 21742456037447. The reversal of 21742456037405 is 50473065424712.

It is not a de Polignac number, because 21742456037405 - 2¹⁰ = 21742456036381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 179229017 + ... + 179350286.

It is an arithmetic number, because the mean of its divisors is an integer number (1664166549864).

Almost surely, 2^{21742456037405} is an apocalyptic number.

It is an amenable number.

21742456037405 is a deficient number, since it is larger than the sum of its proper divisors (4884208760419).

21742456037405 is a wasteful number, since it uses less digits than its factorization.

21742456037405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358579556.

The product of its (nonzero) digits is 5644800, while the sum is 50.

The spelling of 21742456037405 in words is "twenty-one trillion, seven hundred forty-two billion, four hundred fifty-six million, thirty-seven thousand, four hundred five".