200021020212121 has 4 divisors (see below), whose sum is σ = 200024124602292. Its totient is φ = 200017915821952.

The previous prime is 200021020212109. The next prime is 200021020212133. The reversal of 200021020212121 is 121212020120002.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (200021020212109) and next prime (200021020212133).

It can be written as a sum of positive squares in 2 ways, for example, as 136556519347600 + 63464500864521 = 11685740^2 + 7966461^2 .

It is a cyclic number.

It is not a de Polignac number, because 200021020212121 - 2⁷ = 200021020211993 is a prime.

It is a super-2 number, since 2×200021020212121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200021020212095 and 200021020212104.

It is not an unprimeable number, because it can be changed into a prime (200021020272121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1552098436 + ... + 1552227301.

It is an arithmetic number, because the mean of its divisors is an integer number (50006031150573).

Almost surely, 2^{200021020212121} is an apocalyptic number.

It is an amenable number.

200021020212121 is a deficient number, since it is larger than the sum of its proper divisors (3104390171).

200021020212121 is an equidigital number, since it uses as much as digits as its factorization.

200021020212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104390170.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 200021020212121 its reverse (121212020120002), we get a palindrome (321233040332123).

The spelling of 200021020212121 in words is "two hundred trillion, twenty-one billion, twenty million, two hundred twelve thousand, one hundred twenty-one".