2111121010221 has 16 divisors (see below), whose sum is σ = 2912651945280. Its totient is φ = 1359237559680.

The previous prime is 2111121010213. The next prime is 2111121010231. The reversal of 2111121010221 is 1220101211112.

It is a happy number.

It is not a de Polignac number, because 2111121010221 - 2³ = 2111121010213 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111121010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111121010231) 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, 91928290 + ... + 91951251.

It is an arithmetic number, because the mean of its divisors is an integer number (182040746580).

Almost surely, 2^{2111121010221} is an apocalyptic number.

It is an amenable number.

2111121010221 is a deficient number, since it is larger than the sum of its proper divisors (801530935059).

2111121010221 is a wasteful number, since it uses less digits than its factorization.

2111121010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183879676.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2111121010221 its reverse (1220101211112), we get a palindrome (3331222221333).

The spelling of 2111121010221 in words is "two trillion, one hundred eleven billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".