12021356456 has 32 divisors (see below), whose sum is σ = 24093720000. Its totient is φ = 5609112960.

The previous prime is 12021356443. The next prime is 12021356467. The reversal of 12021356456 is 65465312021.

12021356456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12021356456² (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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789206 + ... + 804293.

It is an arithmetic number, because the mean of its divisors is an integer number (752928750).

Almost surely, 2^12021356456 is an apocalyptic number.

It is an amenable number.

12021356456 is an abundant number, since it is smaller than the sum of its proper divisors (12072363544).

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

12021356456 is a wasteful number, since it uses less digits than its factorization.

12021356456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593569 (or 1593565 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 12021356456 its reverse (65465312021), we get a palindrome (77486668477).

The spelling of 12021356456 in words is "twelve billion, twenty-one million, three hundred fifty-six thousand, four hundred fifty-six".