21101121111023 has 4 divisors (see below), whose sum is σ = 21101277009960. Its totient is φ = 21100965212088.

The previous prime is 21101121111011. The next prime is 21101121111073. The reversal of 21101121111023 is 32011112110112.

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 21101121111023 - 2²⁶ = 21101054002159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101121110992 and 21101121111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101121111073) 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, 77746265 + ... + 78017202.

It is an arithmetic number, because the mean of its divisors is an integer number (5275319252490).

Almost surely, 2^{21101121111023} is an apocalyptic number.

21101121111023 is a deficient number, since it is larger than the sum of its proper divisors (155898937).

21101121111023 is a wasteful number, since it uses less digits than its factorization.

21101121111023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155898936.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 21101121111023 its reverse (32011112110112), we get a palindrome (53112233221135).

The spelling of 21101121111023 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-one million, one hundred eleven thousand, twenty-three".