2100312111221 has 4 divisors (see below), whose sum is σ = 2100328896000. Its totient is φ = 2100295326444.

The previous prime is 2100312111203. The next prime is 2100312111223. The reversal of 2100312111221 is 1221112130012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2100312111221 - 2²⁶ = 2100245002357 is a prime.

It is a super-2 number, since 2×2100312111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2100312111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100312111223) 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, 8203271 + ... + 8455428.

It is an arithmetic number, because the mean of its divisors is an integer number (525082224000).

Almost surely, 2^{2100312111221} is an apocalyptic number.

It is an amenable number.

2100312111221 is a deficient number, since it is larger than the sum of its proper divisors (16784779).

2100312111221 is a wasteful number, since it uses less digits than its factorization.

2100312111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16784778.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2100312111221 its reverse (1221112130012), we get a palindrome (3321424241233).

The spelling of 2100312111221 in words is "two trillion, one hundred billion, three hundred twelve million, one hundred eleven thousand, two hundred twenty-one".