21112211023 has 2 divisors, whose sum is σ = 21112211024. Its totient is φ = 21112211022.

The previous prime is 21112211011. The next prime is 21112211047. The reversal of 21112211023 is 32011221112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112211023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112210988 and 21112211006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112211123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556105511 + 10556105512.

It is an arithmetic number, because the mean of its divisors is an integer number (10556105512).

Almost surely, 2^21112211023 is an apocalyptic number.

21112211023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112211023 is an equidigital number, since it uses as much as digits as its factorization.

21112211023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21112211023 its reverse (32011221112), we get a palindrome (53123432135).

The spelling of 21112211023 in words is "twenty-one billion, one hundred twelve million, two hundred eleven thousand, twenty-three".