221045553 has 12 divisors (see below), whose sum is σ = 319483008. Its totient is φ = 147273720.

The previous prime is 221045549. The next prime is 221045581. The reversal of 221045553 is 355540122.

It is a happy number.

221045553 is a `hidden beast` number, since 2 + 2 + 104 + 5 + 553 = 666.

221045553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221045553 - 2² = 221045549 is a prime.

It is a super-2 number, since 2×221045553² = 97722273002151618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221045053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10276 + ... + 23402.

It is an arithmetic number, because the mean of its divisors is an integer number (26623584).

Almost surely, 2^221045553 is an apocalyptic number.

It is an amenable number.

221045553 is a deficient number, since it is larger than the sum of its proper divisors (98437455).

221045553 is a wasteful number, since it uses less digits than its factorization.

221045553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15004 (or 15001 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 221045553 is about 14867.6007815653. The cubic root of 221045553 is about 604.6358968483.

Adding to 221045553 its reverse (355540122), we get a palindrome (576585675).

The spelling of 221045553 in words is "two hundred twenty-one million, forty-five thousand, five hundred fifty-three".