12213021 has 16 divisors (see below), whose sum is σ = 17419968. Its totient is φ = 7584000.

The previous prime is 12213017. The next prime is 12213037. The reversal of 12213021 is 12031221.

It is not a de Polignac number, because 12213021 - 2² = 12213017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12212988 and 12213006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213001) 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, 3966 + ... + 6336.

It is an arithmetic number, because the mean of its divisors is an integer number (1088748).

Almost surely, 2^12213021 is an apocalyptic number.

It is an amenable number.

12213021 is a deficient number, since it is larger than the sum of its proper divisors (5206947).

12213021 is a wasteful number, since it uses less digits than its factorization.

12213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 12213021 is about 3494.7132929612. The cubic root of 12213021 is about 230.2896225436.

Adding to 12213021 its reverse (12031221), we get a palindrome (24244242).

The spelling of 12213021 in words is "twelve million, two hundred thirteen thousand, twenty-one".