21211230023 has 2 divisors, whose sum is σ = 21211230024. Its totient is φ = 21211230022.

The previous prime is 21211229983. The next prime is 21211230091. The reversal of 21211230023 is 32003211212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211230023 - 2⁶ = 21211229959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211229983 and 21211230010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211230823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605615011 + 10605615012.

It is an arithmetic number, because the mean of its divisors is an integer number (10605615012).

Almost surely, 2^21211230023 is an apocalyptic number.

21211230023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211230023 is an equidigital number, since it uses as much as digits as its factorization.

21211230023 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 21211230023 its reverse (32003211212), we get a palindrome (53214441235).

The spelling of 21211230023 in words is "twenty-one billion, two hundred eleven million, two hundred thirty thousand, twenty-three".