12071421 has 12 divisors (see below), whose sum is σ = 17539548. Its totient is φ = 8000064.

The previous prime is 12071407. The next prime is 12071429. The reversal of 12071421 is 12417021.

It can be written as a sum of positive squares in 2 ways, for example, as 11655396 + 416025 = 3414^2 + 645^2 .

It is not a de Polignac number, because 12071421 - 2¹³ = 12063229 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12071394 and 12071403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12071429) 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, 2320 + ... + 5433.

It is an arithmetic number, because the mean of its divisors is an integer number (1461629).

Almost surely, 2^12071421 is an apocalyptic number.

It is an amenable number.

12071421 is a deficient number, since it is larger than the sum of its proper divisors (5468127).

12071421 is a wasteful number, since it uses less digits than its factorization.

12071421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7932 (or 7929 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 12071421 is about 3474.3950552578. The cubic root of 12071421 is about 229.3961539093.

Adding to 12071421 its reverse (12417021), we get a palindrome (24488442).

It can be divided in two parts, 1207 and 1421, that added together give a triangular number (2628 = T₇₂).

The spelling of 12071421 in words is "twelve million, seventy-one thousand, four hundred twenty-one".