12071521 has 16 divisors (see below), whose sum is σ = 15141888. Its totient is φ = 9349200.

The previous prime is 12071503. The next prime is 12071531. The reversal of 12071521 is 12517021.

It is not a de Polignac number, because 12071521 - 2⁵ = 12071489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12071531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15876 + ... + 16618.

It is an arithmetic number, because the mean of its divisors is an integer number (946368).

Almost surely, 2^12071521 is an apocalyptic number.

12071521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12071521 is a deficient number, since it is larger than the sum of its proper divisors (3070367).

12071521 is a wasteful number, since it uses less digits than its factorization.

12071521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 12071521 is about 3474.4094462225. The cubic root of 12071521 is about 229.3967873490.

Adding to 12071521 its reverse (12517021), we get a palindrome (24588542).

The spelling of 12071521 in words is "twelve million, seventy-one thousand, five hundred twenty-one".