12174252421 has 4 divisors (see below), whose sum is σ = 12200321952. Its totient is φ = 12148182892.

The previous prime is 12174252397. The next prime is 12174252427. The reversal of 12174252421 is 12425247121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12425247121 = 7 ⋅1775035303.

It is a cyclic number.

It is not a de Polignac number, because 12174252421 - 2²³ = 12165863813 is a prime.

It is a super-2 number, since 2×12174252421² (a number of 21 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 (12174252427) 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, 13034065 + ... + 13034998.

It is an arithmetic number, because the mean of its divisors is an integer number (3050080488).

Almost surely, 2^12174252421 is an apocalyptic number.

It is an amenable number.

12174252421 is a deficient number, since it is larger than the sum of its proper divisors (26069531).

12174252421 is an equidigital number, since it uses as much as digits as its factorization.

12174252421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26069530.

The product of its digits is 8960, while the sum is 31.

Adding to 12174252421 its reverse (12425247121), we get a palindrome (24599499542).

The spelling of 12174252421 in words is "twelve billion, one hundred seventy-four million, two hundred fifty-two thousand, four hundred twenty-one".