21356267673377 has 8 divisors (see below), whose sum is σ = 26284637136576. Its totient is φ = 16897266730512.

The previous prime is 21356267673343. The next prime is 21356267673431. The reversal of 21356267673377 is 77337676265312.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21356267673377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21356267673337) 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, 117342129983 + ... + 117342130164.

It is an arithmetic number, because the mean of its divisors is an integer number (3285579642072).

Almost surely, 2^{21356267673377} is an apocalyptic number.

It is an amenable number.

21356267673377 is a deficient number, since it is larger than the sum of its proper divisors (4928369463199).

21356267673377 is a wasteful number, since it uses less digits than its factorization.

21356267673377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234684260167.

The product of its digits is 280052640, while the sum is 65.

The spelling of 21356267673377 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred sixty-seven million, six hundred seventy-three thousand, three hundred seventy-seven".