2161453603121 has 4 divisors (see below), whose sum is σ = 2161545341952. Its totient is φ = 2161361864292.

The previous prime is 2161453603103. The next prime is 2161453603123. The reversal of 2161453603121 is 1213063541612.

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 a cyclic number.

It is not a de Polignac number, because 2161453603121 - 2²⁶ = 2161386494257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161453603123) 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, 45834065 + ... + 45881198.

It is an arithmetic number, because the mean of its divisors is an integer number (540386335488).

Almost surely, 2^{2161453603121} is an apocalyptic number.

It is an amenable number.

2161453603121 is a deficient number, since it is larger than the sum of its proper divisors (91738831).

2161453603121 is an equidigital number, since it uses as much as digits as its factorization.

2161453603121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91738830.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 2161453603121 in words is "two trillion, one hundred sixty-one billion, four hundred fifty-three million, six hundred three thousand, one hundred twenty-one".