221860722 has 16 divisors (see below), whose sum is σ = 445953600. Its totient is φ = 73581552.

The previous prime is 221860699. The next prime is 221860733. The reversal of 221860722 is 227068122.

It is a super-2 number, since 2×221860722² = 98444359932722568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221860722.

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, 91713 + ... + 94100.

It is an arithmetic number, because the mean of its divisors is an integer number (27872100).

Almost surely, 2^221860722 is an apocalyptic number.

221860722 is an abundant number, since it is smaller than the sum of its proper divisors (224092878).

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

221860722 is a wasteful number, since it uses less digits than its factorization.

221860722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186017.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 221860722 is about 14894.9898287981. The cubic root of 221860722 is about 605.3782412679.

The spelling of 221860722 in words is "two hundred twenty-one million, eight hundred sixty thousand, seven hundred twenty-two".