12355347421 has 4 divisors (see below), whose sum is σ = 12360534592. Its totient is φ = 12350160252.

The previous prime is 12355347409. The next prime is 12355347461. The reversal of 12355347421 is 12474355321.

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: 12474355321 = 659 ⋅18929219.

It is a cyclic number.

It is not a de Polignac number, because 12355347421 - 2¹³ = 12355339229 is a prime.

It is a super-2 number, since 2×12355347421² (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 (12355347461) 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, 2590011 + ... + 2594776.

It is an arithmetic number, because the mean of its divisors is an integer number (3090133648).

Almost surely, 2^12355347421 is an apocalyptic number.

It is an amenable number.

12355347421 is a deficient number, since it is larger than the sum of its proper divisors (5187171).

12355347421 is an equidigital number, since it uses as much as digits as its factorization.

12355347421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5187170.

The product of its digits is 100800, while the sum is 37.

The spelling of 12355347421 in words is "twelve billion, three hundred fifty-five million, three hundred forty-seven thousand, four hundred twenty-one".