23151155244421 has 4 divisors (see below), whose sum is σ = 23151349524492. Its totient is φ = 23150960964352.

The previous prime is 23151155244383. The next prime is 23151155244479. The reversal of 23151155244421 is 12444255115132.

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 5450539260321 + 17700615984100 = 2334639^2 + 4207210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23151155244421 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 (23151150244421) 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, 96961180 + ... + 97199653.

It is an arithmetic number, because the mean of its divisors is an integer number (5787837381123).

Almost surely, 2^{23151155244421} is an apocalyptic number.

It is an amenable number.

23151155244421 is a deficient number, since it is larger than the sum of its proper divisors (194280071).

23151155244421 is a wasteful number, since it uses less digits than its factorization.

23151155244421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194280070.

The product of its digits is 192000, while the sum is 40.

The spelling of 23151155244421 in words is "twenty-three trillion, one hundred fifty-one billion, one hundred fifty-five million, two hundred forty-four thousand, four hundred twenty-one".