20212121200202 has 4 divisors (see below), whose sum is σ = 30318181800306. Its totient is φ = 10106060600100.

The previous prime is 20212121200189. The next prime is 20212121200213. The reversal of 20212121200202 is 20200212121202.

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., 17404924830241 + 2807196369961 = 4171921^2 + 1675469^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5053030300049 + ... + 5053030300052.

Almost surely, 2^{20212121200202} is an apocalyptic number.

20212121200202 is a deficient number, since it is larger than the sum of its proper divisors (10106060600104).

20212121200202 is a wasteful number, since it uses less digits than its factorization.

20212121200202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10106060600103.

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

Adding to 20212121200202 its reverse (20200212121202), we get a palindrome (40412333321404).

The spelling of 20212121200202 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, two hundred thousand, two hundred two".