21120012020023 has 16 divisors (see below), whose sum is σ = 24646399755840. Its totient is φ = 17724555288576.

The previous prime is 21120012020017. The next prime is 21120012020039. The reversal of 21120012020023 is 32002021002112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120012020023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120012019979 and 21120012020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120012020423) 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, 150772138 + ... + 150912151.

It is an arithmetic number, because the mean of its divisors is an integer number (1540399984740).

Almost surely, 2^{21120012020023} is an apocalyptic number.

21120012020023 is a deficient number, since it is larger than the sum of its proper divisors (3526387735817).

21120012020023 is a wasteful number, since it uses less digits than its factorization.

21120012020023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301684506.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21120012020023 its reverse (32002021002112), we get a palindrome (53122033022135).

The spelling of 21120012020023 in words is "twenty-one trillion, one hundred twenty billion, twelve million, twenty thousand, twenty-three".