21010012023 has 128 divisors (see below), whose sum is σ = 38533791744. Its totient is φ = 9912862080.

The previous prime is 21010012019. The next prime is 21010012027. The reversal of 21010012023 is 32021001012.

It is an interprime number because it is at equal distance from previous prime (21010012019) and next prime (21010012027).

It is not a de Polignac number, because 21010012023 - 2² = 21010012019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010012027) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 24344890 + ... + 24345752.

It is an arithmetic number, because the mean of its divisors is an integer number (301045248).

Almost surely, 2^21010012023 is an apocalyptic number.

21010012023 is a deficient number, since it is larger than the sum of its proper divisors (17523779721).

21010012023 is a wasteful number, since it uses less digits than its factorization.

21010012023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21010012023 its reverse (32021001012), we get a palindrome (53031013035).

The spelling of 21010012023 in words is "twenty-one billion, ten million, twelve thousand, twenty-three".