20232117761621 has 4 divisors (see below), whose sum is σ = 21422242335852. Its totient is φ = 19041993187392.

The previous prime is 20232117761549. The next prime is 20232117761627. The reversal of 20232117761621 is 12616771123202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13159119002500 + 7072998759121 = 3627550^2 + 2659511^2 .

It is a cyclic number.

It is not a de Polignac number, because 20232117761621 - 2²² = 20232113567317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20232117761627) 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, 595062287090 + ... + 595062287123.

It is an arithmetic number, because the mean of its divisors is an integer number (5355560583963).

Almost surely, 2^{20232117761621} is an apocalyptic number.

It is an amenable number.

20232117761621 is a deficient number, since it is larger than the sum of its proper divisors (1190124574231).

20232117761621 is a wasteful number, since it uses less digits than its factorization.

20232117761621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190124574230.

The product of its (nonzero) digits is 84672, while the sum is 41.

Adding to 20232117761621 its reverse (12616771123202), we get a palindrome (32848888884823).

The spelling of 20232117761621 in words is "twenty trillion, two hundred thirty-two billion, one hundred seventeen million, seven hundred sixty-one thousand, six hundred twenty-one".