2100111201221 has 16 divisors (see below), whose sum is σ = 2426320811520. Its totient is φ = 1796498503680.

The previous prime is 2100111201193. The next prime is 2100111201263. The reversal of 2100111201221 is 1221021110012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100111201221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100111201196 and 2100111201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100111201281) 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, 342956 + ... + 2077941.

It is an arithmetic number, because the mean of its divisors is an integer number (151645050720).

Almost surely, 2^{2100111201221} is an apocalyptic number.

It is an amenable number.

2100111201221 is a deficient number, since it is larger than the sum of its proper divisors (326209610299).

2100111201221 is a wasteful number, since it uses less digits than its factorization.

2100111201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425564.

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

Adding to 2100111201221 its reverse (1221021110012), we get a palindrome (3321132311233).

The spelling of 2100111201221 in words is "two trillion, one hundred billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".