12155420036 has 24 divisors (see below), whose sum is σ = 22526677656. Its totient is φ = 5719334400.

The previous prime is 12155420033. The next prime is 12155420111. The reversal of 12155420036 is 63002455121.

It can be written as a sum of positive squares in 4 ways, for example, as 2216526400 + 9938893636 = 47080^2 + 99694^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12155419990 and 12155420008.

It is not an unprimeable number, because it can be changed into a prime (12155420033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 788030 + ... + 803306.

It is an arithmetic number, because the mean of its divisors is an integer number (938611569).

Almost surely, 2^12155420036 is an apocalyptic number.

It is an amenable number.

12155420036 is a deficient number, since it is larger than the sum of its proper divisors (10371257620).

12155420036 is a wasteful number, since it uses less digits than its factorization.

12155420036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26999 (or 26997 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 12155420036 its reverse (63002455121), we get a palindrome (75157875157).

The spelling of 12155420036 in words is "twelve billion, one hundred fifty-five million, four hundred twenty thousand, thirty-six".