2210221121221 has 6 divisors (see below), whose sum is σ = 2221853581766. Its totient is φ = 2198649246600.

The previous prime is 2210221121203. The next prime is 2210221121233. The reversal of 2210221121221 is 1221211220122.

2210221121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2143339920225 + 66881200996 = 1464015^2 + 258614^2 .

It is not a de Polignac number, because 2210221121221 - 2³⁷ = 2072782167749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210221121281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30256290 + ... + 30329251.

Almost surely, 2^{2210221121221} is an apocalyptic number.

It is an amenable number.

2210221121221 is a deficient number, since it is larger than the sum of its proper divisors (11632460545).

2210221121221 is an frugal number, since it uses more digits than its factorization.

2210221121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60585923 (or 60585732 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2210221121221 its reverse (1221211220122), we get a palindrome (3431432341343).

The spelling of 2210221121221 in words is "two trillion, two hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".