20010122123 has 4 divisors (see below), whose sum is σ = 20011597368. Its totient is φ = 20008646880.

The previous prime is 20010122117. The next prime is 20010122131. The reversal of 20010122123 is 32122101002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32122101002 = 2 ⋅16061050501.

It is a cyclic number.

It is not a de Polignac number, because 20010122123 - 2¹² = 20010118027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010122098 and 20010122107.

It is not an unprimeable number, because it can be changed into a prime (20010122423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 717086 + ... + 744467.

It is an arithmetic number, because the mean of its divisors is an integer number (5002899342).

Almost surely, 2^20010122123 is an apocalyptic number.

20010122123 is a deficient number, since it is larger than the sum of its proper divisors (1475245).

20010122123 is a wasteful number, since it uses less digits than its factorization.

20010122123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475244.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20010122123 its reverse (32122101002), we get a palindrome (52132223125).

The spelling of 20010122123 in words is "twenty billion, ten million, one hundred twenty-two thousand, one hundred twenty-three".