23121086537 has 2 divisors, whose sum is σ = 23121086538. Its totient is φ = 23121086536.

The previous prime is 23121086509. The next prime is 23121086587. The reversal of 23121086537 is 73568012132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20599138576 + 2521947961 = 143524^2 + 50219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23121086537 is a prime.

It is a super-3 number, since 3×23121086537³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23121086537.

It is not a weakly prime, because it can be changed into another prime (23121086507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560543268 + 11560543269.

It is an arithmetic number, because the mean of its divisors is an integer number (11560543269).

Almost surely, 2^23121086537 is an apocalyptic number.

It is an amenable number.

23121086537 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121086537 is an equidigital number, since it uses as much as digits as its factorization.

23121086537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

Adding to 23121086537 its reverse (73568012132), we get a palindrome (96689098669).

The spelling of 23121086537 in words is "twenty-three billion, one hundred twenty-one million, eighty-six thousand, five hundred thirty-seven".