21376765407373 has 8 divisors (see below), whose sum is σ = 22634541209592. Its totient is φ = 20119025051136.

The previous prime is 21376765407337. The next prime is 21376765407377. The reversal of 21376765407373 is 37370456767312.

It can be written as a sum of positive squares in 4 ways, for example, as 863230526404 + 20513534880969 = 929102^2 + 4529187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21376765407373 - 2²⁹ = 21376228536461 is a prime.

It is a super-2 number, since 2×21376765407373² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376765407377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7614840 + ... + 10036897.

It is an arithmetic number, because the mean of its divisors is an integer number (2829317651199).

Almost surely, 2^{21376765407373} is an apocalyptic number.

It is an amenable number.

21376765407373 is a deficient number, since it is larger than the sum of its proper divisors (1257775802219).

21376765407373 is a wasteful number, since it uses less digits than its factorization.

21376765407373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17722991.

The product of its (nonzero) digits is 93350880, while the sum is 61.

The spelling of 21376765407373 in words is "twenty-one trillion, three hundred seventy-six billion, seven hundred sixty-five million, four hundred seven thousand, three hundred seventy-three".