221342445 has 12 divisors (see below), whose sum is σ = 383660316. Its totient is φ = 118049280.

The previous prime is 221342389. The next prime is 221342489. The reversal of 221342445 is 544243122.

221342445 is a `hidden beast` number, since 2 + 213 + 4 + 2 + 445 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 112911876 + 108430569 = 10626^2 + 10413^2 .

It is not a de Polignac number, because 221342445 - 2⁹ = 221341933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2459316 + ... + 2459405.

It is an arithmetic number, because the mean of its divisors is an integer number (31971693).

Almost surely, 2^221342445 is an apocalyptic number.

It is an amenable number.

221342445 is a deficient number, since it is larger than the sum of its proper divisors (162317871).

221342445 is a wasteful number, since it uses less digits than its factorization.

221342445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4918732 (or 4918729 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 221342445 is about 14877.5819607892. The cubic root of 221342445 is about 604.9064764480.

Adding to 221342445 its reverse (544243122), we get a palindrome (765585567).

The spelling of 221342445 in words is "two hundred twenty-one million, three hundred forty-two thousand, four hundred forty-five".