221947473 has 24 divisors (see below), whose sum is σ = 330981408. Its totient is φ = 131200000.

The previous prime is 221947433. The next prime is 221947477. The reversal of 221947473 is 374749122.

221947473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221947473 - 2¹⁰ = 221946449 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 53473 + ... + 57473.

It is an arithmetic number, because the mean of its divisors is an integer number (13790892).

Almost surely, 2^221947473 is an apocalyptic number.

It is an amenable number.

221947473 is a deficient number, since it is larger than the sum of its proper divisors (109033935).

221947473 is a wasteful number, since it uses less digits than its factorization.

221947473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097 (or 4056 counting only the distinct ones).

The product of its digits is 84672, while the sum is 39.

The square root of 221947473 is about 14897.9016307667. The cubic root of 221947473 is about 605.4571350950.

The spelling of 221947473 in words is "two hundred twenty-one million, nine hundred forty-seven thousand, four hundred seventy-three".