20100121112111 has 4 divisors (see below), whose sum is σ = 20151792375000. Its totient is φ = 20048449849224.

The previous prime is 20100121112107. The next prime is 20100121112143. The reversal of 20100121112111 is 11121112100102.

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 20100121112111 - 2² = 20100121112107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100121112411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25835630861 + ... + 25835631638.

It is an arithmetic number, because the mean of its divisors is an integer number (5037948093750).

Almost surely, 2^{20100121112111} is an apocalyptic number.

20100121112111 is a deficient number, since it is larger than the sum of its proper divisors (51671262889).

20100121112111 is an equidigital number, since it uses as much as digits as its factorization.

20100121112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51671262888.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20100121112111 its reverse (11121112100102), we get a palindrome (31221233212213).

The spelling of 20100121112111 in words is "twenty trillion, one hundred billion, one hundred twenty-one million, one hundred twelve thousand, one hundred eleven".