21213102023 has 2 divisors, whose sum is σ = 21213102024. Its totient is φ = 21213102022.

The previous prime is 21213102017. The next prime is 21213102049. The reversal of 21213102023 is 32020131212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213102023 - 2¹⁰ = 21213100999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213101992 and 21213102010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213108023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606551011 + 10606551012.

It is an arithmetic number, because the mean of its divisors is an integer number (10606551012).

Almost surely, 2^21213102023 is an apocalyptic number.

21213102023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213102023 is an equidigital number, since it uses as much as digits as its factorization.

21213102023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21213102023 its reverse (32020131212), we get a palindrome (53233233235).

The spelling of 21213102023 in words is "twenty-one billion, two hundred thirteen million, one hundred two thousand, twenty-three".