221939850 has 96 divisors (see below), whose sum is σ = 619960320. Its totient is φ = 52056000.

The previous prime is 221939843. The next prime is 221939869. The reversal of 221939850 is 58939122.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221939799 and 221939808.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48981 + ... + 53319.

It is an arithmetic number, because the mean of its divisors is an integer number (6457920).

Almost surely, 2^221939850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221939850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309980160).

221939850 is an abundant number, since it is smaller than the sum of its proper divisors (398020470).

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

221939850 is a wasteful number, since it uses less digits than its factorization.

221939850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396 (or 4391 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 221939850 is about 14897.6457871705. The cubic root of 221939850 is about 605.4502033459.

The spelling of 221939850 in words is "two hundred twenty-one million, nine hundred thirty-nine thousand, eight hundred fifty".