12023121556 has 12 divisors (see below), whose sum is σ = 21046363380. Its totient is φ = 6009874880.

The previous prime is 12023121541. The next prime is 12023121557. The reversal of 12023121556 is 65512132021.

It can be written as a sum of positive squares in 2 ways, for example, as 4772599056 + 7250522500 = 69084^2 + 85150^2 .

It is a super-2 number, since 2×12023121556² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12023121557) 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, 405361 + ... + 434008.

It is an arithmetic number, because the mean of its divisors is an integer number (1753863615).

Almost surely, 2^12023121556 is an apocalyptic number.

It is an amenable number.

12023121556 is a deficient number, since it is larger than the sum of its proper divisors (9023241824).

12023121556 is a wasteful number, since it uses less digits than its factorization.

12023121556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842954 (or 842952 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 12023121556 its reverse (65512132021), we get a palindrome (77535253577).

The spelling of 12023121556 in words is "twelve billion, twenty-three million, one hundred twenty-one thousand, five hundred fifty-six".