2100111212021 has 8 divisors (see below), whose sum is σ = 2134027329120. Its totient is φ = 2066270717808.

The previous prime is 2100111211981. The next prime is 2100111212027. The reversal of 2100111212021 is 1202121110012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2100111212021 - 2³⁰ = 2099037470197 is a prime.

It is a super-2 number, since 2×2100111212021² (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 = 2100111211987 and 2100111212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100111212027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18849731 + ... + 18960816.

It is an arithmetic number, because the mean of its divisors is an integer number (266753416140).

Almost surely, 2^{2100111212021} is an apocalyptic number.

It is an amenable number.

2100111212021 is a deficient number, since it is larger than the sum of its proper divisors (33916117099).

2100111212021 is an equidigital number, since it uses as much as digits as its factorization.

2100111212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37811443.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2100111212021 its reverse (1202121110012), we get a palindrome (3302232322033).

It can be divided in two parts, 2100111 and 212021, that added together give a palindrome (2312132).

The spelling of 2100111212021 in words is "two trillion, one hundred billion, one hundred eleven million, two hundred twelve thousand, twenty-one".