200121201220202 has 4 divisors (see below), whose sum is σ = 300181801830306. Its totient is φ = 100060600610100.

The previous prime is 200121201220201. The next prime is 200121201220277. The reversal of 200121201220202 is 202022102121002.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 187590797711641 + 12530403508561 = 13696379^2 + 3539831^2 .

It is not an unprimeable number, because it can be changed into a prime (200121201220201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50030300305049 + ... + 50030300305052.

Almost surely, 2^{200121201220202} is an apocalyptic number.

200121201220202 is a deficient number, since it is larger than the sum of its proper divisors (100060600610104).

200121201220202 is a wasteful number, since it uses less digits than its factorization.

200121201220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100060600610103.

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

Adding to 200121201220202 its reverse (202022102121002), we get a palindrome (402143303341204).

The spelling of 200121201220202 in words is "two hundred trillion, one hundred twenty-one billion, two hundred one million, two hundred twenty thousand, two hundred two".