2222207521 has 4 divisors (see below), whose sum is σ = 2224385044. Its totient is φ = 2220030000.

The previous prime is 2222207501. The next prime is 2222207539. The reversal of 2222207521 is 1257022222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1257022222 = 2 ⋅628511111.

It can be written as a sum of positive squares in 2 ways, for example, as 1767025296 + 455182225 = 42036^2 + 21335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2222207521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2222207501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1087230 + ... + 1089271.

It is an arithmetic number, because the mean of its divisors is an integer number (556096261).

Almost surely, 2^2222207521 is an apocalyptic number.

It is an amenable number.

2222207521 is a deficient number, since it is larger than the sum of its proper divisors (2177523).

2222207521 is a wasteful number, since it uses less digits than its factorization.

2222207521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177522.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 2222207521 is about 47140.2961488364. The cubic root of 2222207521 is about 1304.9530027163.

Adding to 2222207521 its reverse (1257022222), we get a palindrome (3479229743).

The spelling of 2222207521 in words is "two billion, two hundred twenty-two million, two hundred seven thousand, five hundred twenty-one".