12457675421 has 6 divisors (see below), whose sum is σ = 12582250266. Its totient is φ = 12334322000.

The previous prime is 12457675393. The next prime is 12457675441.

It is a happy number.

12457675421 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 3 ways, for example, as 11906083225 + 551592196 = 109115^2 + 23486^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12457675421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12457675441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 600410 + ... + 620811.

It is an arithmetic number, because the mean of its divisors is an integer number (2097041711).

Almost surely, 2^12457675421 is an apocalyptic number.

It is an amenable number.

12457675421 is a deficient number, since it is larger than the sum of its proper divisors (124574845).

12457675421 is an equidigital number, since it uses as much as digits as its factorization.

12457675421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221423 (or 1221322 counting only the distinct ones).

The product of its digits is 470400, while the sum is 44.

The spelling of 12457675421 in words is "twelve billion, four hundred fifty-seven million, six hundred seventy-five thousand, four hundred twenty-one".