21012200023 has 2 divisors, whose sum is σ = 21012200024. Its totient is φ = 21012200022.

The previous prime is 21012199991. The next prime is 21012200047. The reversal of 21012200023 is 32000221012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012200023 - 2⁵ = 21012199991 is a prime.

It is a super-2 number, since 2×21012200023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012199976 and 21012200012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012200323) 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 as a sum of consecutive naturals, namely, 10506100011 + 10506100012.

It is an arithmetic number, because the mean of its divisors is an integer number (10506100012).

Almost surely, 2^21012200023 is an apocalyptic number.

21012200023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012200023 is an equidigital number, since it uses as much as digits as its factorization.

21012200023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21012200023 its reverse (32000221012), we get a palindrome (53012421035).

The spelling of 21012200023 in words is "twenty-one billion, twelve million, two hundred thousand, twenty-three".