2021111212221 has 16 divisors (see below), whose sum is σ = 2994263841600. Its totient is φ = 1347396220944.

The previous prime is 2021111212207. The next prime is 2021111212271. The reversal of 2021111212221 is 1222121111202.

2021111212221 is a `hidden beast` number, since 20 + 211 + 1 + 1 + 212 + 221 = 666.

It is not a de Polignac number, because 2021111212221 - 2⁶ = 2021111212157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021111212194 and 2021111212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021111212271) 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, 4125535 + ... + 4589363.

It is an arithmetic number, because the mean of its divisors is an integer number (187141490100).

Almost surely, 2^{2021111212221} is an apocalyptic number.

It is an amenable number.

2021111212221 is a deficient number, since it is larger than the sum of its proper divisors (973152629379).

2021111212221 is a wasteful number, since it uses less digits than its factorization.

2021111212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625225 (or 625219 counting only the distinct ones).

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

Adding to 2021111212221 its reverse (1222121111202), we get a palindrome (3243232323423).

The spelling of 2021111212221 in words is "two trillion, twenty-one billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty-one".