981200221 has 4 divisors (see below), whose sum is σ = 981335772. Its totient is φ = 981064672.

The previous prime is 981200219. The next prime is 981200243. The reversal of 981200221 is 122002189.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236728996 + 744471225 = 15386^2 + 27285^2 .

It is a cyclic number.

It is not a de Polignac number, because 981200221 - 2¹ = 981200219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981200201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56266 + ... + 71611.

It is an arithmetic number, because the mean of its divisors is an integer number (245333943).

Almost surely, 2^981200221 is an apocalyptic number.

It is an amenable number.

981200221 is a deficient number, since it is larger than the sum of its proper divisors (135551).

981200221 is a wasteful number, since it uses less digits than its factorization.

981200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135550.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 981200221 is about 31324.1156459364. The cubic root of 981200221 is about 993.6937214493.

The spelling of 981200221 in words is "nine hundred eighty-one million, two hundred thousand, two hundred twenty-one".