2121021120123 has 24 divisors (see below), whose sum is σ = 3236073251840. Its totient is φ = 1336577442480.

The previous prime is 2121021120109. The next prime is 2121021120139. The reversal of 2121021120123 is 3210211201212.

2121021120123 is a `hidden beast` number, since 21 + 210 + 211 + 201 + 23 = 666.

It is not a de Polignac number, because 2121021120123 - 2⁴ = 2121021120107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121021120096 and 2121021120105.

It is not an unprimeable number, because it can be changed into a prime (2121021120223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88385983 + ... + 88409976.

Almost surely, 2^{2121021120123} is an apocalyptic number.

2121021120123 is a deficient number, since it is larger than the sum of its proper divisors (1115052131717).

2121021120123 is a wasteful number, since it uses less digits than its factorization.

2121021120123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176796039 (or 176796036 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 2121021120123 its reverse (3210211201212), we get a palindrome (5331232321335).

The spelling of 2121021120123 in words is "two trillion, one hundred twenty-one billion, twenty-one million, one hundred twenty thousand, one hundred twenty-three".