20121201101123 has 4 divisors (see below), whose sum is σ = 20122311132000. Its totient is φ = 20120091070248.

The previous prime is 20121201101117. The next prime is 20121201101129. The reversal of 20121201101123 is 32110110212102.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (20121201101117) and next prime (20121201101129).

It is a cyclic number.

It is not a de Polignac number, because 20121201101123 - 2¹⁶ = 20121201035587 is a prime.

It is a super-2 number, since 2×20121201101123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121201101129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554988248 + ... + 555024501.

It is an arithmetic number, because the mean of its divisors is an integer number (5030577783000).

Almost surely, 2^{20121201101123} is an apocalyptic number.

20121201101123 is a deficient number, since it is larger than the sum of its proper divisors (1110030877).

20121201101123 is a wasteful number, since it uses less digits than its factorization.

20121201101123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110030876.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 20121201101123 its reverse (32110110212102), we get a palindrome (52231311313225).

The spelling of 20121201101123 in words is "twenty trillion, one hundred twenty-one billion, two hundred one million, one hundred one thousand, one hundred twenty-three".