2220100121 has 2 divisors, whose sum is σ = 2220100122. Its totient is φ = 2220100120.

The previous prime is 2220100111. The next prime is 2220100187. The reversal of 2220100121 is 1210010222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1993176025 + 226924096 = 44645^2 + 15064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2220100121 is a prime.

It is not a weakly prime, because it can be changed into another prime (2220100111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110050060 + 1110050061.

It is an arithmetic number, because the mean of its divisors is an integer number (1110050061).

Almost surely, 2^2220100121 is an apocalyptic number.

It is an amenable number.

2220100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220100121 is an equidigital number, since it uses as much as digits as its factorization.

2220100121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2220100121 is about 47117.9384205209. The cubic root of 2220100121 is about 1304.5403608250.

Adding to 2220100121 its reverse (1210010222), we get a palindrome (3430110343).

It can be divided in two parts, 2220100 and 121, that multiplied together give a square (268632100 = 16390²).

The spelling of 2220100121 in words is "two billion, two hundred twenty million, one hundred thousand, one hundred twenty-one".