21002010023 has 2 divisors, whose sum is σ = 21002010024. Its totient is φ = 21002010022.

The previous prime is 21002009957. The next prime is 21002010037. The reversal of 21002010023 is 32001020012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002010023 - 2²⁰ = 21000961447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002009986 and 21002010013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002010823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501005011 + 10501005012.

It is an arithmetic number, because the mean of its divisors is an integer number (10501005012).

Almost surely, 2^21002010023 is an apocalyptic number.

21002010023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002010023 is an equidigital number, since it uses as much as digits as its factorization.

21002010023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21002010023 its reverse (32001020012), we get a palindrome (53003030035).

The spelling of 21002010023 in words is "twenty-one billion, two million, ten thousand, twenty-three".