221452505 has 16 divisors (see below), whose sum is σ = 280221120. Its totient is φ = 167542848.

The previous prime is 221452501. The next prime is 221452507. The reversal of 221452505 is 505254122.

221452505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221452505 - 2² = 221452501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221452501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63179 + ... + 66591.

It is an arithmetic number, because the mean of its divisors is an integer number (17513820).

Almost surely, 2^221452505 is an apocalyptic number.

It is an amenable number.

221452505 is a deficient number, since it is larger than the sum of its proper divisors (58768615).

221452505 is a wasteful number, since it uses less digits than its factorization.

221452505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 221452505 is about 14881.2803548619. The cubic root of 221452505 is about 605.0067207777.

The spelling of 221452505 in words is "two hundred twenty-one million, four hundred fifty-two thousand, five hundred five".