221134553 has 4 divisors (see below), whose sum is σ = 222458880. Its totient is φ = 219810228.

The previous prime is 221134549. The next prime is 221134561. The reversal of 221134553 is 355431122.

It is a happy number.

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 221134553 - 2² = 221134549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221134583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661913 + ... + 662246.

It is an arithmetic number, because the mean of its divisors is an integer number (55614720).

Almost surely, 2^221134553 is an apocalyptic number.

It is an amenable number.

221134553 is a deficient number, since it is larger than the sum of its proper divisors (1324327).

221134553 is a wasteful number, since it uses less digits than its factorization.

221134553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324326.

The product of its digits is 3600, while the sum is 26.

The square root of 221134553 is about 14870.5935658265. The cubic root of 221134553 is about 604.7170345346.

Adding to 221134553 its reverse (355431122), we get a palindrome (576565675).

The spelling of 221134553 in words is "two hundred twenty-one million, one hundred thirty-four thousand, five hundred fifty-three".