12161421 has 12 divisors (see below), whose sum is σ = 18217472. Its totient is φ = 8107452.

The previous prime is 12161417. The next prime is 12161431. The reversal of 12161421 is 12416121.

12161421 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12161421 - 2² = 12161417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12161394 and 12161403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12161431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24781 + ... + 25266.

Almost surely, 2^12161421 is an apocalyptic number.

It is an amenable number.

12161421 is a deficient number, since it is larger than the sum of its proper divisors (6056051).

12161421 is an frugal number, since it uses more digits than its factorization.

12161421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50062 (or 50050 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 12161421 is about 3487.3228987291. The cubic root of 12161421 is about 229.9648402461.

Adding to 12161421 its reverse (12416121), we get a palindrome (24577542).

The spelling of 12161421 in words is "twelve million, one hundred sixty-one thousand, four hundred twenty-one".