2210121221221 has 2 divisors, whose sum is σ = 2210121221222. Its totient is φ = 2210121221220.

The previous prime is 2210121221213. The next prime is 2210121221239. The reversal of 2210121221221 is 1221221210122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2210095516321 + 25704900 = 1486639^2 + 5070^2 .

It is a cyclic number.

It is not a de Polignac number, because 2210121221221 - 2³ = 2210121221213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2210121201221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105060610610 + 1105060610611.

It is an arithmetic number, because the mean of its divisors is an integer number (1105060610611).

Almost surely, 2^{2210121221221} is an apocalyptic number.

It is an amenable number.

2210121221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2210121221221 is an equidigital number, since it uses as much as digits as its factorization.

2210121221221 is an evil number, because the sum of its binary digits is even.

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

Adding to 2210121221221 its reverse (1221221210122), we get a palindrome (3431342431343).

It can be divided in two parts, 2210121 and 221221, that added together give a palindrome (2431342).

The spelling of 2210121221221 in words is "two trillion, two hundred ten billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".