12456277780421 has 16 divisors (see below), whose sum is σ = 12813822271488. Its totient is φ = 12101338569600.

The previous prime is 12456277780411. The next prime is 12456277780451. The reversal of 12456277780421 is 12408777265421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12456277780421 is a prime.

It is a super-2 number, since 2×12456277780421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12456277780411) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21187580 + ... + 21767546.

It is an arithmetic number, because the mean of its divisors is an integer number (800863891968).

Almost surely, 2^{12456277780421} is an apocalyptic number.

It is an amenable number.

12456277780421 is a deficient number, since it is larger than the sum of its proper divisors (357544491067).

12456277780421 is a wasteful number, since it uses less digits than its factorization.

12456277780421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582212.

The product of its (nonzero) digits is 10536960, while the sum is 56.

The spelling of 12456277780421 in words is "twelve trillion, four hundred fifty-six billion, two hundred seventy-seven million, seven hundred eighty thousand, four hundred twenty-one".