2120021122221 has 8 divisors (see below), whose sum is σ = 3140772032960. Its totient is φ = 1413347414796.

The previous prime is 2120021122217. The next prime is 2120021122231. The reversal of 2120021122221 is 1222211200212.

It is a happy number.

2120021122221 is a `hidden beast` number, since 212 + 0 + 0 + 211 + 22 + 221 = 666.

It is not a de Polignac number, because 2120021122221 - 2² = 2120021122217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120021122194 and 2120021122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120021122211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39259650385 + ... + 39259650438.

It is an arithmetic number, because the mean of its divisors is an integer number (392596504120).

Almost surely, 2^{2120021122221} is an apocalyptic number.

It is an amenable number.

2120021122221 is a deficient number, since it is larger than the sum of its proper divisors (1020750910739).

2120021122221 is an equidigital number, since it uses as much as digits as its factorization.

2120021122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78519300832 (or 78519300826 counting only the distinct ones).

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

Adding to 2120021122221 its reverse (1222211200212), we get a palindrome (3342232322433).

The spelling of 2120021122221 in words is "two trillion, one hundred twenty billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".