200111021212121 has 4 divisors (see below), whose sum is σ = 203391529756644. Its totient is φ = 196830512667600.

The previous prime is 200111021212117. The next prime is 200111021212127. The reversal of 200111021212121 is 121212120111002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44838612314896 + 155272408897225 = 6696164^2 + 12460835^2 .

It is a cyclic number.

It is not a de Polignac number, because 200111021212121 - 2² = 200111021212117 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 200111021212121.

It is not an unprimeable number, because it can be changed into a prime (200111021212127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640254272170 + ... + 1640254272291.

It is an arithmetic number, because the mean of its divisors is an integer number (50847882439161).

Almost surely, 2^{200111021212121} is an apocalyptic number.

It is an amenable number.

200111021212121 is a deficient number, since it is larger than the sum of its proper divisors (3280508544523).

200111021212121 is an equidigital number, since it uses as much as digits as its factorization.

200111021212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280508544522.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 200111021212121 its reverse (121212120111002), we get a palindrome (321323141323123).

The spelling of 200111021212121 in words is "two hundred trillion, one hundred eleven billion, twenty-one million, two hundred twelve thousand, one hundred twenty-one".