221946572 has 24 divisors (see below), whose sum is σ = 404388096. Its totient is φ = 106489728.

The previous prime is 221946559. The next prime is 221946583. The reversal of 221946572 is 275649122.

221946572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533 + ... + 21075.

It is an arithmetic number, because the mean of its divisors is an integer number (16849504).

Almost surely, 2^221946572 is an apocalyptic number.

It is an amenable number.

221946572 is a deficient number, since it is larger than the sum of its proper divisors (182441524).

221946572 is a wasteful number, since it uses less digits than its factorization.

221946572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20657 (or 20655 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 221946572 is about 14897.8713915781. The cubic root of 221946572 is about 605.4563158056.

The spelling of 221946572 in words is "two hundred twenty-one million, nine hundred forty-six thousand, five hundred seventy-two".