200121020220221 has 8 divisors (see below), whose sum is σ = 200140627962744. Its totient is φ = 200101413191680.

The previous prime is 200121020220181. The next prime is 200121020220241. The reversal of 200121020220221 is 122022020121002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65746231644025 + 134374788576196 = 8108405^2 + 11592014^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 200121020220221 - 2⁶ = 200121020220157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 200121020220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121020220241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684634661 + ... + 684926901.

It is an arithmetic number, because the mean of its divisors is an integer number (25017578495343).

Almost surely, 2^{200121020220221} is an apocalyptic number.

It is an amenable number.

200121020220221 is a deficient number, since it is larger than the sum of its proper divisors (19607742523).

200121020220221 is a wasteful number, since it uses less digits than its factorization.

200121020220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356991.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 200121020220221 its reverse (122022020121002), we get a palindrome (322143040341223).

The spelling of 200121020220221 in words is "two hundred trillion, one hundred twenty-one billion, twenty million, two hundred twenty thousand, two hundred twenty-one".