2111121022221 has 12 divisors (see below), whose sum is σ = 3049821065148. Its totient is φ = 1407218307264.

The previous prime is 2111121022187. The next prime is 2111121022223. The reversal of 2111121022221 is 1222201211112.

2111121022221 is a `hidden beast` number, since 211 + 1 + 1 + 210 + 22 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 65849205321 + 2045271816900 = 256611^2 + 1430130^2 .

It is not a de Polignac number, because 2111121022221 - 2³⁴ = 2093941153037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111121022194 and 2111121022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111121022223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16240630 + ... + 16370103.

It is an arithmetic number, because the mean of its divisors is an integer number (254151755429).

Almost surely, 2^{2111121022221} is an apocalyptic number.

It is an amenable number.

2111121022221 is a deficient number, since it is larger than the sum of its proper divisors (938700042927).

2111121022221 is a wasteful number, since it uses less digits than its factorization.

2111121022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32617932 (or 32617929 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2111121022221 its reverse (1222201211112), we get a palindrome (3333322233333).

The spelling of 2111121022221 in words is "two trillion, one hundred eleven billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".