2221101221 has 4 divisors (see below), whose sum is σ = 2351754252. Its totient is φ = 2090448192.

The previous prime is 2221101217. The next prime is 2221101229. The reversal of 2221101221 is 1221011222.

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 1355270596 + 865830625 = 36814^2 + 29425^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221101221 - 2² = 2221101217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221101196 and 2221101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221101229) 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, 65326490 + ... + 65326523.

It is an arithmetic number, because the mean of its divisors is an integer number (587938563).

Almost surely, 2^2221101221 is an apocalyptic number.

It is an amenable number.

2221101221 is a deficient number, since it is larger than the sum of its proper divisors (130653031).

2221101221 is a wasteful number, since it uses less digits than its factorization.

2221101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130653030.

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

The square root of 2221101221 is about 47128.5605657546. The cubic root of 2221101221 is about 1304.7364149118.

Adding to 2221101221 its reverse (1221011222), we get a palindrome (3442112443).

The spelling of 2221101221 in words is "two billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty-one".