2221131021 has 4 divisors (see below), whose sum is σ = 2961508032. Its totient is φ = 1480754012.

The previous prime is 2221131001. The next prime is 2221131079. The reversal of 2221131021 is 1201311222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2221131021 - 2²⁷ = 2086913293 is a prime.

It is a super-3 number, since 3×2221131021³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221131001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370188501 + ... + 370188506.

It is an arithmetic number, because the mean of its divisors is an integer number (740377008).

Almost surely, 2^2221131021 is an apocalyptic number.

It is an amenable number.

2221131021 is a deficient number, since it is larger than the sum of its proper divisors (740377011).

2221131021 is an equidigital number, since it uses as much as digits as its factorization.

2221131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740377010.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2221131021 is about 47128.8767211781. The cubic root of 2221131021 is about 1304.7422500010.

Adding to 2221131021 its reverse (1201311222), we get a palindrome (3422442243).

The spelling of 2221131021 in words is "two billion, two hundred twenty-one million, one hundred thirty-one thousand, twenty-one".