21073353016319 has 4 divisors (see below), whose sum is σ = 21105234035160. Its totient is φ = 21041471997480.

The previous prime is 21073353016139. The next prime is 21073353016361. The reversal of 21073353016319 is 91361035337012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21073353016319 - 2⁸ = 21073353016063 is a prime.

It is a super-2 number, since 2×21073353016319² (a number of 27 digits) contains 22 as substring.

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 21073353016319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21073353016399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15940508429 + ... + 15940509750.

It is an arithmetic number, because the mean of its divisors is an integer number (5276308508790).

Almost surely, 2^{21073353016319} is an apocalyptic number.

21073353016319 is a deficient number, since it is larger than the sum of its proper divisors (31881018841).

21073353016319 is an equidigital number, since it uses as much as digits as its factorization.

21073353016319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31881018840.

The product of its (nonzero) digits is 306180, while the sum is 44.

The spelling of 21073353016319 in words is "twenty-one trillion, seventy-three billion, three hundred fifty-three million, sixteen thousand, three hundred nineteen".