21100023101023 has 4 divisors (see below), whose sum is σ = 21221988552648. Its totient is φ = 20978057649400.

The previous prime is 21100023101011. The next prime is 21100023101077. The reversal of 21100023101023 is 32010132000112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21100023101023 - 2³⁷ = 20962584147551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100023100988 and 21100023101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100023101083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60982725553 + ... + 60982725898.

It is an arithmetic number, because the mean of its divisors is an integer number (5305497138162).

Almost surely, 2^{21100023101023} is an apocalyptic number.

21100023101023 is a deficient number, since it is larger than the sum of its proper divisors (121965451625).

21100023101023 is a wasteful number, since it uses less digits than its factorization.

21100023101023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121965451624.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21100023101023 its reverse (32010132000112), we get a palindrome (53110155101135).

The spelling of 21100023101023 in words is "twenty-one trillion, one hundred billion, twenty-three million, one hundred one thousand, twenty-three".