21100111121023 has 16 divisors (see below), whose sum is σ = 24473450881440. Its totient is φ = 17978659891200.

The previous prime is 21100111120987. The next prime is 21100111121083. The reversal of 21100111121023 is 32012111100112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21100111121023 - 2⁹ = 21100111120511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100111120988 and 21100111121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100111121083) 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, 234052068 + ... + 234142201.

It is an arithmetic number, because the mean of its divisors is an integer number (1529590680090).

Almost surely, 2^{21100111121023} is an apocalyptic number.

21100111121023 is a deficient number, since it is larger than the sum of its proper divisors (3373339760417).

21100111121023 is a wasteful number, since it uses less digits than its factorization.

21100111121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468194538.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21100111121023 its reverse (32012111100112), we get a palindrome (53112222221135).

The spelling of 21100111121023 in words is "twenty-one trillion, one hundred billion, one hundred eleven million, one hundred twenty-one thousand, twenty-three".