21301221023 has 2 divisors, whose sum is σ = 21301221024. Its totient is φ = 21301221022.

The previous prime is 21301221001. The next prime is 21301221037. The reversal of 21301221023 is 32012210312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21301221023 - 2⁶ = 21301220959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21301220992 and 21301221010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21301421023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650610511 + 10650610512.

It is an arithmetic number, because the mean of its divisors is an integer number (10650610512).

Almost surely, 2^21301221023 is an apocalyptic number.

21301221023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301221023 is an equidigital number, since it uses as much as digits as its factorization.

21301221023 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 21301221023 its reverse (32012210312), we get a palindrome (53313431335).

The spelling of 21301221023 in words is "twenty-one billion, three hundred one million, two hundred twenty-one thousand, twenty-three".