221649822 has 24 divisors (see below), whose sum is σ = 482686776. Its totient is φ = 73507056.

The previous prime is 221649811. The next prime is 221649829. The reversal of 221649822 is 228946122.

221649822 is a `hidden beast` number, since 2 + 2 + 1 + 649 + 8 + 2 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221649829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27708 + ... + 34799.

It is an arithmetic number, because the mean of its divisors is an integer number (20111949).

Almost surely, 2^221649822 is an apocalyptic number.

221649822 is an abundant number, since it is smaller than the sum of its proper divisors (261036954).

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

221649822 is a wasteful number, since it uses less digits than its factorization.

221649822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62712 (or 62709 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 221649822 is about 14887.9085838139. The cubic root of 221649822 is about 605.1863569979.

The spelling of 221649822 in words is "two hundred twenty-one million, six hundred forty-nine thousand, eight hundred twenty-two".