21101210023 has 2 divisors, whose sum is σ = 21101210024. Its totient is φ = 21101210022.

The previous prime is 21101210021. The next prime is 21101210041. The reversal of 21101210023 is 32001210112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101210023 - 2¹ = 21101210021 is a prime.

It is a super-2 number, since 2×21101210023² (a number of 21 digits) contains 22 as substring.

Together with 21101210021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21101209985 and 21101210012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101210021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550605011 + 10550605012.

It is an arithmetic number, because the mean of its divisors is an integer number (10550605012).

Almost surely, 2^21101210023 is an apocalyptic number.

21101210023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101210023 is an equidigital number, since it uses as much as digits as its factorization.

21101210023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21101210023 its reverse (32001210112), we get a palindrome (53102420135).

The spelling of 21101210023 in words is "twenty-one billion, one hundred one million, two hundred ten thousand, twenty-three".