23121510019 has 2 divisors, whose sum is σ = 23121510020. Its totient is φ = 23121510018.

The previous prime is 23121509977. The next prime is 23121510023. The reversal of 23121510019 is 91001512132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23121510019 - 2¹¹ = 23121507971 is a prime.

It is a super-2 number, since 2×23121510019² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23121509975 and 23121510002.

It is not a weakly prime, because it can be changed into another prime (23121514019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560755009 + 11560755010.

It is an arithmetic number, because the mean of its divisors is an integer number (11560755010).

Almost surely, 2^23121510019 is an apocalyptic number.

23121510019 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121510019 is an equidigital number, since it uses as much as digits as its factorization.

23121510019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 25.

The spelling of 23121510019 in words is "twenty-three billion, one hundred twenty-one million, five hundred ten thousand, nineteen".