2210120212221 has 12 divisors (see below), whose sum is σ = 3192416322940. Its totient is φ = 1473404031360.

The previous prime is 2210120212199. The next prime is 2210120212259. The reversal of 2210120212221 is 1222120210122.

It is a happy number.

2210120212221 is a `hidden beast` number, since 2 + 210 + 1 + 20 + 212 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 937479015225 + 1272641196996 = 968235^2 + 1128114^2 .

It is not a de Polignac number, because 2210120212221 - 2⁷ = 2210120212093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2210120212194 and 2210120212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210120212021) 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, 881445 + ... + 2279733.

Almost surely, 2^{2210120212221} is an apocalyptic number.

It is an amenable number.

2210120212221 is a deficient number, since it is larger than the sum of its proper divisors (982296110719).

2210120212221 is a wasteful number, since it uses less digits than its factorization.

2210120212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573916 (or 1573913 counting only the distinct ones).

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

Adding to 2210120212221 its reverse (1222120210122), we get a palindrome (3432240422343).

The spelling of 2210120212221 in words is "two trillion, two hundred ten billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".