21212321023 has 2 divisors, whose sum is σ = 21212321024. Its totient is φ = 21212321022.

The previous prime is 21212320999. The next prime is 21212321027. The reversal of 21212321023 is 32012321212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212321023 - 2⁵ = 21212320991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212321027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606160511 + 10606160512.

It is an arithmetic number, because the mean of its divisors is an integer number (10606160512).

Almost surely, 2^21212321023 is an apocalyptic number.

21212321023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212321023 is an equidigital number, since it uses as much as digits as its factorization.

21212321023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21212321023 its reverse (32012321212), we get a palindrome (53224642235).

The spelling of 21212321023 in words is "twenty-one billion, two hundred twelve million, three hundred twenty-one thousand, twenty-three".