23121442551 has 32 divisors (see below), whose sum is σ = 32974663680. Its totient is φ = 14368860000.

The previous prime is 23121442537. The next prime is 23121442607. The reversal of 23121442551 is 15524412132.

It is not a de Polignac number, because 23121442551 - 2⁷ = 23121442423 is a prime.

It is a super-2 number, since 2×23121442551² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121442651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1177746 + ... + 1197216.

It is an arithmetic number, because the mean of its divisors is an integer number (1030458240).

Almost surely, 2^23121442551 is an apocalyptic number.

23121442551 is a deficient number, since it is larger than the sum of its proper divisors (9853221129).

23121442551 is a wasteful number, since it uses less digits than its factorization.

23121442551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19827.

The product of its digits is 9600, while the sum is 30.

Adding to 23121442551 its reverse (15524412132), we get a palindrome (38645854683).

The spelling of 23121442551 in words is "twenty-three billion, one hundred twenty-one million, four hundred forty-two thousand, five hundred fifty-one".