200121220112221 has 4 divisors (see below), whose sum is σ = 200123257046944. Its totient is φ = 200119183177500.

The previous prime is 200121220112189. The next prime is 200121220112273. The reversal of 200121220112221 is 122211022121002.

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.

It is a cyclic number.

It is not a de Polignac number, because 200121220112221 - 2⁵ = 200121220112189 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 (200121220116221) 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, 1018319985 + ... + 1018516486.

It is an arithmetic number, because the mean of its divisors is an integer number (50030814261736).

Almost surely, 2^{200121220112221} is an apocalyptic number.

It is an amenable number.

200121220112221 is a deficient number, since it is larger than the sum of its proper divisors (2036934723).

200121220112221 is an equidigital number, since it uses as much as digits as its factorization.

200121220112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036934722.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 200121220112221 its reverse (122211022121002), we get a palindrome (322332242233223).

The spelling of 200121220112221 in words is "two hundred trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-one".