21356147276471 has 16 divisors (see below), whose sum is σ = 24796664414976. Its totient is φ = 18013599179136.

The previous prime is 21356147276447. The next prime is 21356147276473. The reversal of 21356147276471 is 17467274165312.

It is a cyclic number.

It is not a de Polignac number, because 21356147276471 - 2²⁶ = 21356080167607 is a prime.

It is a super-3 number, since 3×21356147276471³ (a number of 41 digits) contains 333 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 (21356147276473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22845521 + ... + 23761946.

It is an arithmetic number, because the mean of its divisors is an integer number (1549791525936).

Almost surely, 2^{21356147276471} is an apocalyptic number.

21356147276471 is a deficient number, since it is larger than the sum of its proper divisors (3440517138505).

21356147276471 is an equidigital number, since it uses as much as digits as its factorization.

21356147276471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46608518.

The product of its digits is 11854080, while the sum is 56.

The spelling of 21356147276471 in words is "twenty-one trillion, three hundred fifty-six billion, one hundred forty-seven million, two hundred seventy-six thousand, four hundred seventy-one".