12270021 has 16 divisors (see below), whose sum is σ = 16684800. Its totient is φ = 8019648.

The previous prime is 12269989. The next prime is 12270047. The reversal of 12270021 is 12007221.

It is not a de Polignac number, because 12270021 - 2⁵ = 12269989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12270221) 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, 51220 + ... + 51458.

It is an arithmetic number, because the mean of its divisors is an integer number (1042800).

Almost surely, 2^12270021 is an apocalyptic number.

It is an amenable number.

12270021 is a deficient number, since it is larger than the sum of its proper divisors (4414779).

12270021 is a wasteful number, since it uses less digits than its factorization.

12270021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 12270021 is about 3502.8589751801. The cubic root of 12270021 is about 230.6473320227.

Adding to 12270021 its reverse (12007221), we get a palindrome (24277242).

The spelling of 12270021 in words is "twelve million, two hundred seventy thousand, twenty-one".