221315850 has 108 divisors (see below), whose sum is σ = 691748694. Its totient is φ = 50581440.

The previous prime is 221315837. The next prime is 221315873. The reversal of 221315850 is 58513122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 146821689 + 74494161 = 12117^2 + 8631^2 .

It is a super-2 number, since 2×221315850² = 97961410922445000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 17032 + ... + 27068.

Almost surely, 2^221315850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221315850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345874347).

221315850 is an abundant number, since it is smaller than the sum of its proper divisors (470432844).

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

221315850 is a wasteful number, since it uses less digits than its factorization.

221315850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10069 (or 10054 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 221315850 is about 14876.6881395020. The cubic root of 221315850 is about 604.8822483308.

Adding to 221315850 its reverse (58513122), we get a palindrome (279828972).

The spelling of 221315850 in words is "two hundred twenty-one million, three hundred fifteen thousand, eight hundred fifty".