2220101221 has 4 divisors (see below), whose sum is σ = 2390878252. Its totient is φ = 2049324192.

The previous prime is 2220101203. The next prime is 2220101231. The reversal of 2220101221 is 1221010222.

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 1288020321 + 932080900 = 35889^2 + 30530^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220101221 - 2¹⁷ = 2219970149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 170777017 = 2220101221 / (2 + 2 + 2 + 0 + 1 + 0 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220101231) 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, 85388496 + ... + 85388521.

It is an arithmetic number, because the mean of its divisors is an integer number (597719563).

Almost surely, 2^2220101221 is an apocalyptic number.

It is an amenable number.

2220101221 is a deficient number, since it is larger than the sum of its proper divisors (170777031).

2220101221 is a wasteful number, since it uses less digits than its factorization.

2220101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170777030.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2220101221 is about 47117.9500933561. The cubic root of 2220101221 is about 1304.5405762799.

Adding to 2220101221 its reverse (1221010222), we get a palindrome (3441111443).

Subtracting from 2220101221 its reverse (1221010222), we obtain a palindrome (999090999).

The spelling of 2220101221 in words is "two billion, two hundred twenty million, one hundred one thousand, two hundred twenty-one".