21044220023 has 2 divisors, whose sum is σ = 21044220024. Its totient is φ = 21044220022.

The previous prime is 21044220007. The next prime is 21044220059. The reversal of 21044220023 is 32002244012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21044220023 - 2⁴ = 21044220007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21044219977 and 21044220004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21044225023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522110011 + 10522110012.

It is an arithmetic number, because the mean of its divisors is an integer number (10522110012).

Almost surely, 2^21044220023 is an apocalyptic number.

21044220023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044220023 is an equidigital number, since it uses as much as digits as its factorization.

21044220023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21044220023 its reverse (32002244012), we get a palindrome (53046464035).

The spelling of 21044220023 in words is "twenty-one billion, forty-four million, two hundred twenty thousand, twenty-three".