221409470 has 32 divisors (see below), whose sum is σ = 420418080. Its totient is φ = 83721600.

The previous prime is 221409469. The next prime is 221409481. The reversal of 221409470 is 74904122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115520 + ... + 117420.

It is an arithmetic number, because the mean of its divisors is an integer number (13138065).

Almost surely, 2^221409470 is an apocalyptic number.

221409470 is a deficient number, since it is larger than the sum of its proper divisors (199008610).

221409470 is a wasteful number, since it uses less digits than its factorization.

221409470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 221409470 is about 14879.8343404757. The cubic root of 221409470 is about 604.9675277975.

The spelling of 221409470 in words is "two hundred twenty-one million, four hundred nine thousand, four hundred seventy".