221947474 has 32 divisors (see below), whose sum is σ = 401402880. Its totient is φ = 89912592.

The previous prime is 221947433. The next prime is 221947477. The reversal of 221947474 is 474749122.

It is a happy number.

221947474 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (221947477) 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, 197077 + ... + 198199.

It is an arithmetic number, because the mean of its divisors is an integer number (12543840).

Almost surely, 2^221947474 is an apocalyptic number.

221947474 is a deficient number, since it is larger than the sum of its proper divisors (179455406).

221947474 is a wasteful number, since it uses less digits than its factorization.

221947474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894.

The product of its digits is 112896, while the sum is 40.

The square root of 221947474 is about 14897.9016643284. The cubic root of 221947474 is about 605.4571360043.

The spelling of 221947474 in words is "two hundred twenty-one million, nine hundred forty-seven thousand, four hundred seventy-four".