12402120156 has 24 divisors (see below), whose sum is σ = 28978548480. Its totient is φ = 4128287472.

The previous prime is 12402120149. The next prime is 12402120187. The reversal of 12402120156 is 65102120421.

It is a super-2 number, since 2×12402120156² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 710086 + ... + 727341.

It is an arithmetic number, because the mean of its divisors is an integer number (1207439520).

Almost surely, 2^12402120156 is an apocalyptic number.

It is an amenable number.

12402120156 is an abundant number, since it is smaller than the sum of its proper divisors (16576428324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12402120156 is a wasteful number, since it uses less digits than its factorization.

12402120156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438153 (or 1438151 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 12402120156 its reverse (65102120421), we get a palindrome (77504240577).

The spelling of 12402120156 in words is "twelve billion, four hundred two million, one hundred twenty thousand, one hundred fifty-six".