221005264 has 20 divisors (see below), whose sum is σ = 450735040. Its totient is φ = 104686560.

The previous prime is 221005247. The next prime is 221005303. The reversal of 221005264 is 462500122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363192 + ... + 363799.

It is an arithmetic number, because the mean of its divisors is an integer number (22536752).

Almost surely, 2^221005264 is an apocalyptic number.

It is an amenable number.

221005264 is an abundant number, since it is smaller than the sum of its proper divisors (229729776).

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

221005264 is a wasteful number, since it uses less digits than its factorization.

221005264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727018 (or 727012 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 221005264 is about 14866.2457937436. The cubic root of 221005264 is about 604.5991598417.

Adding to 221005264 its reverse (462500122), we get a palindrome (683505386).

The spelling of 221005264 in words is "two hundred twenty-one million, five thousand, two hundred sixty-four".