222121553 has 4 divisors (see below), whose sum is σ = 225164388. Its totient is φ = 219078720.

The previous prime is 222121547. The next prime is 222121573. The reversal of 222121553 is 355121222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355121222 = 2 ⋅177560611.

It can be written as a sum of positive squares in 2 ways, for example, as 191739409 + 30382144 = 13847^2 + 5512^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121553 - 2⁸ = 222121297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521308 + ... + 1521453.

It is an arithmetic number, because the mean of its divisors is an integer number (56291097).

Almost surely, 2^222121553 is an apocalyptic number.

It is an amenable number.

222121553 is a deficient number, since it is larger than the sum of its proper divisors (3042835).

222121553 is an equidigital number, since it uses as much as digits as its factorization.

222121553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042834.

The product of its digits is 1200, while the sum is 23.

The square root of 222121553 is about 14903.7429191462. The cubic root of 222121553 is about 605.6153864041.

Adding to 222121553 its reverse (355121222), we get a palindrome (577242775).

The spelling of 222121553 in words is "two hundred twenty-two million, one hundred twenty-one thousand, five hundred fifty-three".