2111202221 has 2 divisors, whose sum is σ = 2111202222. Its totient is φ = 2111202220.

The previous prime is 2111202209. The next prime is 2111202229. The reversal of 2111202221 is 1222021112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1458399721 + 652802500 = 38189^2 + 25550^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111202221 - 2²⁶ = 2044093357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111202196 and 2111202205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111202229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055601110 + 1055601111.

It is an arithmetic number, because the mean of its divisors is an integer number (1055601111).

Almost surely, 2^2111202221 is an apocalyptic number.

It is an amenable number.

2111202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111202221 is an equidigital number, since it uses as much as digits as its factorization.

2111202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2111202221 is about 45947.8206338451. The cubic root of 2111202221 is about 1282.8521647133.

Adding to 2111202221 its reverse (1222021112), we get a palindrome (3333223333).

The spelling of 2111202221 in words is "two billion, one hundred eleven million, two hundred two thousand, two hundred twenty-one".