221990850 has 36 divisors (see below), whose sum is σ = 596416626. Its totient is φ = 59197440.

The previous prime is 221990833. The next prime is 221990891. The reversal of 221990850 is 58099122.

It can be written as a sum of positive squares in 3 ways, for example, as 178944129 + 43046721 = 13377^2 + 6561^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 246207 + ... + 247106.

Almost surely, 2^221990850 is an apocalyptic number.

221990850 is an abundant number, since it is smaller than the sum of its proper divisors (374425776).

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

221990850 is a wasteful number, since it uses less digits than its factorization.

221990850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493331 (or 493323 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 221990850 is about 14899.3573686921. The cubic root of 221990850 is about 605.4965756633.

The spelling of 221990850 in words is "two hundred twenty-one million, nine hundred ninety thousand, eight hundred fifty".