2210002121221 has 4 divisors (see below), whose sum is σ = 2231883330444. Its totient is φ = 2188120912000.

The previous prime is 2210002121177. The next prime is 2210002121237. The reversal of 2210002121221 is 1221212000122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1145411517121 + 1064590604100 = 1070239^2 + 1031790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2210002121221 - 2¹¹ = 2210002119173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2210002121195 and 2210002121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210002121021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10940604460 + ... + 10940604661.

It is an arithmetic number, because the mean of its divisors is an integer number (557970832611).

Almost surely, 2^{2210002121221} is an apocalyptic number.

It is an amenable number.

2210002121221 is a deficient number, since it is larger than the sum of its proper divisors (21881209223).

2210002121221 is a wasteful number, since it uses less digits than its factorization.

2210002121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21881209222.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2210002121221 its reverse (1221212000122), we get a palindrome (3431214121343).

The spelling of 2210002121221 in words is "two trillion, two hundred ten billion, two million, one hundred twenty-one thousand, two hundred twenty-one".