23011000021 has 2 divisors, whose sum is σ = 23011000022. Its totient is φ = 23011000020.

The previous prime is 23011000007. The next prime is 23011000031. The reversal of 23011000021 is 12000011032.

It is an a-pointer prime, because the next prime (23011000031) can be obtained adding 23011000021 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22660786225 + 350213796 = 150535^2 + 18714^2 .

It is a cyclic number.

It is not a de Polignac number, because 23011000021 - 2⁹ = 23010999509 is a prime.

It is a super-2 number, since 2×23011000021² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23010999971 and 23011000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23011000031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11505500010 + 11505500011.

It is an arithmetic number, because the mean of its divisors is an integer number (11505500011).

Almost surely, 2^23011000021 is an apocalyptic number.

It is an amenable number.

23011000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23011000021 is an equidigital number, since it uses as much as digits as its factorization.

23011000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 23011000021 its reverse (12000011032), we get a palindrome (35011011053).

The spelling of 23011000021 in words is "twenty-three billion, eleven million, twenty-one", and thus it is an aban number and an uban number.