221264646 has 32 divisors (see below), whose sum is σ = 464583168. Its totient is φ = 70118400.

The previous prime is 221264621. The next prime is 221264647. The reversal of 221264646 is 646462122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221264647) 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, 18246 + ... + 27846.

It is an arithmetic number, because the mean of its divisors is an integer number (14518224).

Almost surely, 2^221264646 is an apocalyptic number.

221264646 is an abundant number, since it is smaller than the sum of its proper divisors (243318522).

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

221264646 is a wasteful number, since it uses less digits than its factorization.

221264646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9796.

The product of its digits is 27648, while the sum is 33.

The square root of 221264646 is about 14874.9670924006. The cubic root of 221264646 is about 604.8355958813.

The spelling of 221264646 in words is "two hundred twenty-one million, two hundred sixty-four thousand, six hundred forty-six".