111100010001021 has 24 divisors (see below), whose sum is σ = 169149634084704. Its totient is φ = 72852465564720.

The previous prime is 111100010001011. The next prime is 111100010001023. The reversal of 111100010001021 is 120100010001111.

It is not a de Polignac number, because 111100010001021 - 2⁶ = 111100010000957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 111100010000994 and 111100010001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100010001023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3747539991 + ... + 3747569636.

It is an arithmetic number, because the mean of its divisors is an integer number (7047901420196).

Almost surely, 2^{111100010001021} is an apocalyptic number.

It is an amenable number.

111100010001021 is a deficient number, since it is larger than the sum of its proper divisors (58049624083683).

111100010001021 is an frugal number, since it uses more digits than its factorization.

111100010001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7495109703 (or 7495109691 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 111100010001021 its reverse (120100010001111), we get a palindrome (231200020002132).

The spelling of 111100010001021 in words is "one hundred eleven trillion, one hundred billion, ten million, one thousand, twenty-one".