12477421 has 4 divisors (see below), whose sum is σ = 13611744. Its totient is φ = 11343100.

The previous prime is 12477403. The next prime is 12477449.

12477421 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12477421 - 2⁹ = 12476909 is a prime.

It is a super-2 number, since 2×12477421² = 311372069622482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12477421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12477721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567145 + ... + 567166.

It is an arithmetic number, because the mean of its divisors is an integer number (3402936).

Almost surely, 2^12477421 is an apocalyptic number.

12477421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12477421 is a deficient number, since it is larger than the sum of its proper divisors (1134323).

12477421 is a wasteful number, since it uses less digits than its factorization.

12477421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134322.

The product of its digits is 3136, while the sum is 28.

The square root of 12477421 is about 3532.3393098625. The cubic root of 12477421 is about 231.9396208807.

It can be divided in two parts, 1247 and 7421, that added together give a palindrome (8668).

The spelling of 12477421 in words is "twelve million, four hundred seventy-seven thousand, four hundred twenty-one".