2221221331 has 32 divisors (see below), whose sum is σ = 2720563200. Its totient is φ = 1772547840.

The previous prime is 2221221313. The next prime is 2221221347. The reversal of 2221221331 is 1331221222.

It is not a de Polignac number, because 2221221331 - 2¹¹ = 2221219283 is a prime.

It is a super-2 number, since 2×2221221331² = 9867648402578823122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221221299 and 2221221308.

It is not an unprimeable number, because it can be changed into a prime (2221221311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2573406 + ... + 2574268.

It is an arithmetic number, because the mean of its divisors is an integer number (85017600).

Almost surely, 2^2221221331 is an apocalyptic number.

2221221331 is a deficient number, since it is larger than the sum of its proper divisors (499341869).

2221221331 is a wasteful number, since it uses less digits than its factorization.

2221221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339.

The product of its digits is 288, while the sum is 19.

The square root of 2221221331 is about 47129.8348289064. The cubic root of 2221221331 is about 1304.7599331355.

Adding to 2221221331 its reverse (1331221222), we get a palindrome (3552442553).

The spelling of 2221221331 in words is "two billion, two hundred twenty-one million, two hundred twenty-one thousand, three hundred thirty-one".