200156221 has 4 divisors (see below), whose sum is σ = 204414912. Its totient is φ = 195897532.

The previous prime is 200156207. The next prime is 200156227. The reversal of 200156221 is 122651002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122651002 = 2 ⋅61325501.

It is a cyclic number.

It is not a de Polignac number, because 200156221 - 2¹⁵ = 200123453 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 (200156227) 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, 2129275 + ... + 2129368.

It is an arithmetic number, because the mean of its divisors is an integer number (51103728).

Almost surely, 2^200156221 is an apocalyptic number.

It is an amenable number.

200156221 is a deficient number, since it is larger than the sum of its proper divisors (4258691).

200156221 is an equidigital number, since it uses as much as digits as its factorization.

200156221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258690.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 200156221 is about 14147.6577920163. The cubic root of 200156221 is about 584.9557723400.

The spelling of 200156221 in words is "two hundred million, one hundred fifty-six thousand, two hundred twenty-one".