20001202121111 has 2 divisors, whose sum is σ = 20001202121112. Its totient is φ = 20001202121110.

The previous prime is 20001202121107. The next prime is 20001202121123. The reversal of 20001202121111 is 11112120210002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20001202121111 - 2² = 20001202121107 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001202121171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000601060555 + 10000601060556.

It is an arithmetic number, because the mean of its divisors is an integer number (10000601060556).

Almost surely, 2^{20001202121111} is an apocalyptic number.

20001202121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001202121111 is an equidigital number, since it uses as much as digits as its factorization.

20001202121111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20001202121111 its reverse (11112120210002), we get a palindrome (31113322331113).

The spelling of 20001202121111 in words is "twenty trillion, one billion, two hundred two million, one hundred twenty-one thousand, one hundred eleven".