20110121111123 has 2 divisors, whose sum is σ = 20110121111124. Its totient is φ = 20110121111122.

The previous prime is 20110121111077. The next prime is 20110121111137. The reversal of 20110121111123 is 32111112101102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20110121111123 - 2¹⁶ = 20110121045587 is a prime.

It is a super-2 number, since 2×20110121111123² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20110121113123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055060555561 + 10055060555562.

It is an arithmetic number, because the mean of its divisors is an integer number (10055060555562).

Almost surely, 2^{20110121111123} is an apocalyptic number.

20110121111123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110121111123 is an equidigital number, since it uses as much as digits as its factorization.

20110121111123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 20110121111123 its reverse (32111112101102), we get a palindrome (52221233212225).

The spelling of 20110121111123 in words is "twenty trillion, one hundred ten billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-three".