21347929763161 has 16 divisors (see below), whose sum is σ = 21542483128320. Its totient is φ = 21153806069760.

The previous prime is 21347929763143. The next prime is 21347929763191. The reversal of 21347929763161 is 16136792974312.

It is a cyclic number.

It is not a de Polignac number, because 21347929763161 - 2²⁹ = 21347392892249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21347929763161.

It is not an unprimeable number, because it can be changed into a prime (21347929763191) 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, 349242681 + ... + 349303801.

It is an arithmetic number, because the mean of its divisors is an integer number (1346405195520).

Almost surely, 2^{21347929763161} is an apocalyptic number.

It is an amenable number.

21347929763161 is a deficient number, since it is larger than the sum of its proper divisors (194553365159).

21347929763161 is a wasteful number, since it uses less digits than its factorization.

21347929763161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64584.

The product of its digits is 20575296, while the sum is 61.

The spelling of 21347929763161 in words is "twenty-one trillion, three hundred forty-seven billion, nine hundred twenty-nine million, seven hundred sixty-three thousand, one hundred sixty-one".