200002020121 has 16 divisors (see below), whose sum is σ = 214972003728. Its totient is φ = 185407488000.

The previous prime is 200002020079. The next prime is 200002020149. The reversal of 200002020121 is 121020200002.

It can be written as a sum of positive squares in 8 ways, for example, as 69135340096 + 130866680025 = 262936^2 + 361755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200002020121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200002020098 and 200002020107.

It is not an unprimeable number, because it can be changed into a prime (200002020181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29611 + ... + 633151.

It is an arithmetic number, because the mean of its divisors is an integer number (13435750233).

Almost surely, 2^200002020121 is an apocalyptic number.

It is an amenable number.

200002020121 is a deficient number, since it is larger than the sum of its proper divisors (14969983607).

200002020121 is a wasteful number, since it uses less digits than its factorization.

200002020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603852.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 200002020121 its reverse (121020200002), we get a palindrome (321022220123).

The spelling of 200002020121 in words is "two hundred billion, two million, twenty thousand, one hundred twenty-one".