2221331021 has 32 divisors (see below), whose sum is σ = 2904975360. Its totient is φ = 1649336256.

The previous prime is 2221330999. The next prime is 2221331029. The reversal of 2221331021 is 1201331222.

It is a cyclic number.

It is not a de Polignac number, because 2221331021 - 2⁶ = 2221330957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221331029) 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, 179000 + ... + 191006.

It is an arithmetic number, because the mean of its divisors is an integer number (90780480).

Almost surely, 2^2221331021 is an apocalyptic number.

It is an amenable number.

2221331021 is a deficient number, since it is larger than the sum of its proper divisors (683644339).

2221331021 is a wasteful number, since it uses less digits than its factorization.

2221331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12153.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2221331021 is about 47130.9985147779. The cubic root of 2221331021 is about 1304.7814103230.

Adding to 2221331021 its reverse (1201331222), we get a palindrome (3422662243).

The spelling of 2221331021 in words is "two billion, two hundred twenty-one million, three hundred thirty-one thousand, twenty-one".