20121120023 has 4 divisors (see below), whose sum is σ = 21180126360. Its totient is φ = 19062113688.

The previous prime is 20121120007. The next prime is 20121120077. The reversal of 20121120023 is 32002112102.

It is a happy number.

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 20121120023 - 2⁴ = 20121120007 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 (20121120223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529503140 + ... + 529503177.

It is an arithmetic number, because the mean of its divisors is an integer number (5295031590).

Almost surely, 2^20121120023 is an apocalyptic number.

20121120023 is a deficient number, since it is larger than the sum of its proper divisors (1059006337).

20121120023 is a wasteful number, since it uses less digits than its factorization.

20121120023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059006336.

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

Adding to 20121120023 its reverse (32002112102), we get a palindrome (52123232125).

The spelling of 20121120023 in words is "twenty billion, one hundred twenty-one million, one hundred twenty thousand, twenty-three".