21012220123023 has 16 divisors (see below), whose sum is σ = 28984480053120. Its totient is φ = 13524123719904.

The previous prime is 21012220123019. The next prime is 21012220123061. The reversal of 21012220123023 is 32032102221012.

It is not a de Polignac number, because 21012220123023 - 2² = 21012220123019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012220123523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7576861 + ... + 9971622.

It is an arithmetic number, because the mean of its divisors is an integer number (1811530003320).

Almost surely, 2^{21012220123023} is an apocalyptic number.

21012220123023 is a deficient number, since it is larger than the sum of its proper divisors (7972259930097).

21012220123023 is a wasteful number, since it uses less digits than its factorization.

21012220123023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17562278.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21012220123023 its reverse (32032102221012), we get a palindrome (53044322344035).

The spelling of 21012220123023 in words is "twenty-one trillion, twelve billion, two hundred twenty million, one hundred twenty-three thousand, twenty-three".