221279466 has 16 divisors (see below), whose sum is σ = 446045184. Its totient is φ = 73178784.

The previous prime is 221279449. The next prime is 221279467. The reversal of 221279466 is 664972122.

221279466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221279467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144435 + ... + 145958.

It is an arithmetic number, because the mean of its divisors is an integer number (27877824).

Almost surely, 2^221279466 is an apocalyptic number.

221279466 is an abundant number, since it is smaller than the sum of its proper divisors (224765718).

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

221279466 is a wasteful number, since it uses less digits than its factorization.

221279466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290525.

The product of its digits is 72576, while the sum is 39.

The square root of 221279466 is about 14875.4652364220. The cubic root of 221279466 is about 604.8490992637.

The spelling of 221279466 in words is "two hundred twenty-one million, two hundred seventy-nine thousand, four hundred sixty-six".