221250555 has 64 divisors (see below), whose sum is σ = 409328640. Its totient is φ = 113299200.

The previous prime is 221250553. The next prime is 221250571. The reversal of 221250555 is 555052122.

221250555 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 221250555 - 2¹ = 221250553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (221250551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 392704 + ... + 393266.

It is an arithmetic number, because the mean of its divisors is an integer number (6395760).

Almost surely, 2^221250555 is an apocalyptic number.

221250555 is a deficient number, since it is larger than the sum of its proper divisors (188078085).

221250555 is a wasteful number, since it uses less digits than its factorization.

221250555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 221250555 is about 14874.4934367527. The cubic root of 221250555 is about 604.8227561748.

The spelling of 221250555 in words is "two hundred twenty-one million, two hundred fifty thousand, five hundred fifty-five".