2101022211221 has 2 divisors, whose sum is σ = 2101022211222. Its totient is φ = 2101022211220.

The previous prime is 2101022211217. The next prime is 2101022211247. The reversal of 2101022211221 is 1221122201012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1994834212996 + 106187998225 = 1412386^2 + 325865^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101022211221 - 2² = 2101022211217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2101022211221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101022216221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050511105610 + 1050511105611.

It is an arithmetic number, because the mean of its divisors is an integer number (1050511105611).

Almost surely, 2^{2101022211221} is an apocalyptic number.

It is an amenable number.

2101022211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101022211221 is an equidigital number, since it uses as much as digits as its factorization.

2101022211221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2101022211221 its reverse (1221122201012), we get a palindrome (3322144412233).

The spelling of 2101022211221 in words is "two trillion, one hundred one billion, twenty-two million, two hundred eleven thousand, two hundred twenty-one".