1021100111023 has 4 divisors (see below), whose sum is σ = 1065495768048. Its totient is φ = 976704454000.

The previous prime is 1021100110999. The next prime is 1021100111047. The reversal of 1021100111023 is 3201110011201.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1021100110999) and next prime (1021100111047).

It is a cyclic number.

It is not a de Polignac number, because 1021100111023 - 2²⁹ = 1020563240111 is a prime.

It is a super-2 number, since 2×1021100111023² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021100110994 and 1021100111012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021100111723) 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, 22197828478 + ... + 22197828523.

It is an arithmetic number, because the mean of its divisors is an integer number (266373942012).

Almost surely, 2^{1021100111023} is an apocalyptic number.

1021100111023 is a deficient number, since it is larger than the sum of its proper divisors (44395657025).

1021100111023 is an equidigital number, since it uses as much as digits as its factorization.

1021100111023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44395657024.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1021100111023 its reverse (3201110011201), we get a palindrome (4222210122224).

The spelling of 1021100111023 in words is "one trillion, twenty-one billion, one hundred million, one hundred eleven thousand, twenty-three".