2168342107921 has 4 divisors (see below), whose sum is σ = 2365464117744. Its totient is φ = 1971220098100.

The previous prime is 2168342107889. The next prime is 2168342107927. The reversal of 2168342107921 is 1297012438612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2168342107921 - 2⁵ = 2168342107889 is a prime.

It is a super-2 number, since 2×2168342107921² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2168342107927) 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, 98561004895 + ... + 98561004916.

It is an arithmetic number, because the mean of its divisors is an integer number (591366029436).

Almost surely, 2^{2168342107921} is an apocalyptic number.

It is an amenable number.

2168342107921 is a deficient number, since it is larger than the sum of its proper divisors (197122009823).

2168342107921 is a wasteful number, since it uses less digits than its factorization.

2168342107921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197122009822.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 2168342107921 in words is "two trillion, one hundred sixty-eight billion, three hundred forty-two million, one hundred seven thousand, nine hundred twenty-one".