12103221421 has 4 divisors (see below), whose sum is σ = 12129362752. Its totient is φ = 12077080092.

The previous prime is 12103221413. The next prime is 12103221467. The reversal of 12103221421 is 12412230121.

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: 12412230121 = 19379 ⋅640499.

It is a cyclic number.

It is not a de Polignac number, because 12103221421 - 2³ = 12103221413 is a prime.

It is a super-3 number, since 3×12103221421³ (a number of 31 digits) contains 333 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 (12103221401) 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, 13069971 + ... + 13070896.

It is an arithmetic number, because the mean of its divisors is an integer number (3032340688).

Almost surely, 2^12103221421 is an apocalyptic number.

It is an amenable number.

12103221421 is a deficient number, since it is larger than the sum of its proper divisors (26141331).

12103221421 is an equidigital number, since it uses as much as digits as its factorization.

12103221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26141330.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 12103221421 its reverse (12412230121), we get a palindrome (24515451542).

The spelling of 12103221421 in words is "twelve billion, one hundred three million, two hundred twenty-one thousand, four hundred twenty-one".