2120211022221 has 12 divisors (see below), whose sum is σ = 3063905956540. Its totient is φ = 1412837588160.

The previous prime is 2120211022199. The next prime is 2120211022261. The reversal of 2120211022221 is 1222201120212.

It is a happy number.

2120211022221 is a `hidden beast` number, since 212 + 0 + 211 + 0 + 22 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1093760388900 + 1026450633321 = 1045830^2 + 1013139^2 .

It is not a de Polignac number, because 2120211022221 - 2¹⁵ = 2120210989453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120211022194 and 2120211022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120211022261) 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, 53014456 + ... + 53054433.

Almost surely, 2^{2120211022221} is an apocalyptic number.

It is an amenable number.

2120211022221 is a deficient number, since it is larger than the sum of its proper divisors (943694934319).

2120211022221 is a wasteful number, since it uses less digits than its factorization.

2120211022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106071116 (or 106071113 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2120211022221 its reverse (1222201120212), we get a palindrome (3342412142433).

The spelling of 2120211022221 in words is "two trillion, one hundred twenty billion, two hundred eleven million, twenty-two thousand, two hundred twenty-one".