23121220019 has 2 divisors, whose sum is σ = 23121220020. Its totient is φ = 23121220018.

The previous prime is 23121219943. The next prime is 23121220027. The reversal of 23121220019 is 91002212132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23121220019 - 2⁸ = 23121219763 is a prime.

It is a super-2 number, since 2×23121220019² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23121219976 and 23121220003.

It is not a weakly prime, because it can be changed into another prime (23121220819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560610009 + 11560610010.

It is an arithmetic number, because the mean of its divisors is an integer number (11560610010).

Almost surely, 2^23121220019 is an apocalyptic number.

23121220019 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121220019 is an equidigital number, since it uses as much as digits as its factorization.

23121220019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 23121220019 in words is "twenty-three billion, one hundred twenty-one million, two hundred twenty thousand, nineteen".