21212112023 has 2 divisors, whose sum is σ = 21212112024. Its totient is φ = 21212112022.

The previous prime is 21212112007. The next prime is 21212112079. The reversal of 21212112023 is 32021121212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212112023 - 2⁴ = 21212112007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212111992 and 21212112010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212012023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606056011 + 10606056012.

It is an arithmetic number, because the mean of its divisors is an integer number (10606056012).

Almost surely, 2^21212112023 is an apocalyptic number.

21212112023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212112023 is an equidigital number, since it uses as much as digits as its factorization.

21212112023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21212112023 its reverse (32021121212), we get a palindrome (53233233235).

The spelling of 21212112023 in words is "twenty-one billion, two hundred twelve million, one hundred twelve thousand, twenty-three".