21364757635405 has 16 divisors (see below), whose sum is σ = 25724811752640. Its totient is φ = 17033753267712.

The previous prime is 21364757635379. The next prime is 21364757635513. The reversal of 21364757635405 is 50453675746312.

It is a cyclic number.

It is not a de Polignac number, because 21364757635405 - 2⁹ = 21364757634893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21364757635405.

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, 10063741 + ... + 12000349.

It is an arithmetic number, because the mean of its divisors is an integer number (1607800734540).

Almost surely, 2^{21364757635405} is an apocalyptic number.

It is an amenable number.

21364757635405 is a deficient number, since it is larger than the sum of its proper divisors (4360054117235).

21364757635405 is a wasteful number, since it uses less digits than its factorization.

21364757635405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944108.

The product of its (nonzero) digits is 63504000, while the sum is 58.

The spelling of 21364757635405 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred fifty-seven million, six hundred thirty-five thousand, four hundred five".