23511151421 has 4 divisors (see below), whose sum is σ = 23511535200. Its totient is φ = 23510767644.

The previous prime is 23511151403. The next prime is 23511151427. The reversal of 23511151421 is 12415111532.

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 23511151421 - 2¹⁸ = 23510889277 is a prime.

It is a super-2 number, since 2×23511151421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23511151427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77111 + ... + 230148.

It is an arithmetic number, because the mean of its divisors is an integer number (5877883800).

Almost surely, 2^23511151421 is an apocalyptic number.

It is an amenable number.

23511151421 is a deficient number, since it is larger than the sum of its proper divisors (383779).

23511151421 is an equidigital number, since it uses as much as digits as its factorization.

23511151421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383778.

The product of its digits is 1200, while the sum is 26.

Adding to 23511151421 its reverse (12415111532), we get a palindrome (35926262953).

The spelling of 23511151421 in words is "twenty-three billion, five hundred eleven million, one hundred fifty-one thousand, four hundred twenty-one".