2222457521 has 4 divisors (see below), whose sum is σ = 2276663844. Its totient is φ = 2168251200.

The previous prime is 2222457499. The next prime is 2222457539. The reversal of 2222457521 is 1257542222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1257542222 = 2 ⋅628771111.

It can be written as a sum of positive squares in 2 ways, for example, as 287777296 + 1934680225 = 16964^2 + 43985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222457521 - 2¹⁰ = 2222456497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2222457221) 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, 27103100 + ... + 27103181.

It is an arithmetic number, because the mean of its divisors is an integer number (569165961).

Almost surely, 2^2222457521 is an apocalyptic number.

It is an amenable number.

2222457521 is a deficient number, since it is larger than the sum of its proper divisors (54206323).

2222457521 is an equidigital number, since it uses as much as digits as its factorization.

2222457521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54206322.

The product of its digits is 22400, while the sum is 32.

The square root of 2222457521 is about 47142.9477334627. The cubic root of 2222457521 is about 1305.0019369427.

Adding to 2222457521 its reverse (1257542222), we get a palindrome (3479999743).

The spelling of 2222457521 in words is "two billion, two hundred twenty-two million, four hundred fifty-seven thousand, five hundred twenty-one".