12202021 has 4 divisors (see below), whose sum is σ = 13140652. Its totient is φ = 11263392.

The previous prime is 12202019. The next prime is 12202027. The reversal of 12202021 is 12020221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1404225 + 10797796 = 1185^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 12202021 - 2¹ = 12202019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12201989 and 12202007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12202027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469296 + ... + 469321.

It is an arithmetic number, because the mean of its divisors is an integer number (3285163).

Almost surely, 2^12202021 is an apocalyptic number.

It is an amenable number.

12202021 is a deficient number, since it is larger than the sum of its proper divisors (938631).

12202021 is an equidigital number, since it uses as much as digits as its factorization.

12202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938630.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 12202021 is about 3493.1391326427. The cubic root of 12202021 is about 230.2204628394.

Adding to 12202021 its reverse (12020221), we get a palindrome (24222242).

It can be divided in two parts, 1 and 2202021, that added together give a palindrome (2202022).

The spelling of 12202021 in words is "twelve million, two hundred two thousand, twenty-one".