20000121011111 has 4 divisors (see below), whose sum is σ = 20224841472000. Its totient is φ = 19775400550224.

The previous prime is 20000121011093. The next prime is 20000121011131. The reversal of 20000121011111 is 11111012100002.

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

It is a cyclic number.

It is not a de Polignac number, because 20000121011111 - 2⁴² = 15602074500007 is a prime.

It is a super-3 number, since 3×20000121011111³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000121011092 and 20000121011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000121011131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112360230311 + ... + 112360230488.

It is an arithmetic number, because the mean of its divisors is an integer number (5056210368000).

Almost surely, 2^{20000121011111} is an apocalyptic number.

20000121011111 is a deficient number, since it is larger than the sum of its proper divisors (224720460889).

20000121011111 is an equidigital number, since it uses as much as digits as its factorization.

20000121011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224720460888.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20000121011111 its reverse (11111012100002), we get a palindrome (31111133111113).

The spelling of 20000121011111 in words is "twenty trillion, one hundred twenty-one million, eleven thousand, one hundred eleven".