12021281924 has 24 divisors (see below), whose sum is σ = 21138753888. Its totient is φ = 5981693760.

The previous prime is 12021281917. The next prime is 12021281939. The reversal of 12021281924 is 42918212021.

It is a super-2 number, since 2×12021281924² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929744 + ... + 942584.

It is an arithmetic number, because the mean of its divisors is an integer number (880781412).

Almost surely, 2^12021281924 is an apocalyptic number.

It is an amenable number.

12021281924 is a deficient number, since it is larger than the sum of its proper divisors (9117471964).

12021281924 is a wasteful number, since it uses less digits than its factorization.

12021281924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13955 (or 13953 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

Adding to 12021281924 its reverse (42918212021), we get a palindrome (54939493945).

The spelling of 12021281924 in words is "twelve billion, twenty-one million, two hundred eighty-one thousand, nine hundred twenty-four".