221713450 has 24 divisors (see below), whose sum is σ = 471300192. Its totient is φ = 76015920.

The previous prime is 221713447. The next prime is 221713463. The reversal of 221713450 is 54317122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 316384 + ... + 317083.

It is an arithmetic number, because the mean of its divisors is an integer number (19637508).

Almost surely, 2^221713450 is an apocalyptic number.

221713450 is an abundant number, since it is smaller than the sum of its proper divisors (249586742).

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

221713450 is a wasteful number, since it uses less digits than its factorization.

221713450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633486 (or 633481 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 221713450 is about 14890.0453323689. The cubic root of 221713450 is about 605.2442608168.

The spelling of 221713450 in words is "two hundred twenty-one million, seven hundred thirteen thousand, four hundred fifty".