221252745 has 32 divisors (see below), whose sum is σ = 418533120. Its totient is φ = 97655040.

The previous prime is 221252743. The next prime is 221252747. The reversal of 221252745 is 547252122.

It is an interprime number because it is at equal distance from previous prime (221252743) and next prime (221252747).

It is not a de Polignac number, because 221252745 - 2¹ = 221252743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221252743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33286 + ... + 39375.

It is an arithmetic number, because the mean of its divisors is an integer number (13079160).

Almost surely, 2^221252745 is an apocalyptic number.

It is an amenable number.

221252745 is a deficient number, since it is larger than the sum of its proper divisors (197280375).

221252745 is a wasteful number, since it uses less digits than its factorization.

221252745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72705.

The product of its digits is 11200, while the sum is 30.

The square root of 221252745 is about 14874.5670525229. The cubic root of 221252745 is about 604.8247517366.

The spelling of 221252745 in words is "two hundred twenty-one million, two hundred fifty-two thousand, seven hundred forty-five".