221343045 has 64 divisors (see below), whose sum is σ = 450662400. Its totient is φ = 91963200.

The previous prime is 221343019. The next prime is 221343047. The reversal of 221343045 is 540343122.

221343045 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 221343045 - 2⁵ = 221343013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221343047) 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, 54640 + ... + 58550.

It is an arithmetic number, because the mean of its divisors is an integer number (7041600).

Almost surely, 2^221343045 is an apocalyptic number.

It is an amenable number.

221343045 is an abundant number, since it is smaller than the sum of its proper divisors (229319355).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221343045 is a wasteful number, since it uses less digits than its factorization.

221343045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951 (or 3937 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 221343045 is about 14877.6021253426. The cubic root of 221343045 is about 604.9070230272.

Adding to 221343045 its reverse (540343122), we get a palindrome (761686167).

The spelling of 221343045 in words is "two hundred twenty-one million, three hundred forty-three thousand, forty-five".