20000121111121 has 4 divisors (see below), whose sum is σ = 20000194447600. Its totient is φ = 20000047774644.

The previous prime is 20000121111097. The next prime is 20000121111137. The reversal of 20000121111121 is 12111112100002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20000121111121 - 2⁷ = 20000121110993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20000121111151) 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, 36257631 + ... + 36805108.

It is an arithmetic number, because the mean of its divisors is an integer number (5000048611900).

Almost surely, 2^{20000121111121} is an apocalyptic number.

It is an amenable number.

20000121111121 is a deficient number, since it is larger than the sum of its proper divisors (73336479).

20000121111121 is an equidigital number, since it uses as much as digits as its factorization.

20000121111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73336478.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20000121111121 its reverse (12111112100002), we get a palindrome (32111233211123).

It can be divided in two parts, 20000 and 121111121, that added together give a palindrome (121131121).

The spelling of 20000121111121 in words is "twenty trillion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".