23121255541 has 4 divisors (see below), whose sum is σ = 23152043584. Its totient is φ = 23090467500.

The previous prime is 23121255499. The next prime is 23121255557. The reversal of 23121255541 is 14555212132.

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 23121255541 - 2¹⁹ = 23120731253 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 (23121255581) 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, 15392895 + ... + 15394396.

It is an arithmetic number, because the mean of its divisors is an integer number (5788010896).

Almost surely, 2^23121255541 is an apocalyptic number.

It is an amenable number.

23121255541 is a deficient number, since it is larger than the sum of its proper divisors (30788043).

23121255541 is an equidigital number, since it uses as much as digits as its factorization.

23121255541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30788042.

The product of its digits is 12000, while the sum is 31.

Adding to 23121255541 its reverse (14555212132), we get a palindrome (37676467673).

The spelling of 23121255541 in words is "twenty-three billion, one hundred twenty-one million, two hundred fifty-five thousand, five hundred forty-one".