200121124811 has 2 divisors, whose sum is σ = 200121124812. Its totient is φ = 200121124810.

The previous prime is 200121124793. The next prime is 200121124823. The reversal of 200121124811 is 118421121002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 200121124811 - 2⁶ = 200121124747 is a prime.

It is not a weakly prime, because it can be changed into another prime (200121124871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060562405 + 100060562406.

It is an arithmetic number, because the mean of its divisors is an integer number (100060562406).

Almost surely, 2^200121124811 is an apocalyptic number.

200121124811 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121124811 is an equidigital number, since it uses as much as digits as its factorization.

200121124811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 200121124811 its reverse (118421121002), we get a palindrome (318542245813).

The spelling of 200121124811 in words is "two hundred billion, one hundred twenty-one million, one hundred twenty-four thousand, eight hundred eleven".