12021052456 has 16 divisors (see below), whose sum is σ = 25759398240. Its totient is φ = 5151879600.

The previous prime is 12021052453. The next prime is 12021052457. The reversal of 12021052456 is 65425012021.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (12021052453) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 107330770 + ... + 107330881.

It is an arithmetic number, because the mean of its divisors is an integer number (1609962390).

Almost surely, 2^12021052456 is an apocalyptic number.

It is an amenable number.

12021052456 is an abundant number, since it is smaller than the sum of its proper divisors (13738345784).

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

12021052456 is a wasteful number, since it uses less digits than its factorization.

12021052456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214661664 (or 214661660 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 12021052456 its reverse (65425012021), we get a palindrome (77446064477).

The spelling of 12021052456 in words is "twelve billion, twenty-one million, fifty-two thousand, four hundred fifty-six".