20200121181011 has 2 divisors, whose sum is σ = 20200121181012. Its totient is φ = 20200121181010.

The previous prime is 20200121181001. The next prime is 20200121181041. The reversal of 20200121181011 is 11018112100202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20200121181011 - 2⁶ = 20200121180947 is a prime.

It is not a weakly prime, because it can be changed into another prime (20200121181001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100060590505 + 10100060590506.

It is an arithmetic number, because the mean of its divisors is an integer number (10100060590506).

Almost surely, 2^{20200121181011} is an apocalyptic number.

20200121181011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200121181011 is an equidigital number, since it uses as much as digits as its factorization.

20200121181011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 20200121181011 its reverse (11018112100202), we get a palindrome (31218233281213).

It can be divided in two parts, 2020012 and 1181011, that added together give a palindrome (3201023).

The spelling of 20200121181011 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, one hundred eighty-one thousand, eleven".