12212002021 has 4 divisors (see below), whose sum is σ = 12496002112. Its totient is φ = 11928001932.

The previous prime is 12212002009. The next prime is 12212002067. The reversal of 12212002021 is 12020021221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12020021221 = 13 ⋅924617017.

It is a cyclic number.

It is not a de Polignac number, because 12212002021 - 2⁹ = 12212001509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212001992 and 12212002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212002721) 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, 141999981 + ... + 142000066.

It is an arithmetic number, because the mean of its divisors is an integer number (3124000528).

Almost surely, 2^12212002021 is an apocalyptic number.

It is an amenable number.

12212002021 is a deficient number, since it is larger than the sum of its proper divisors (284000091).

12212002021 is an equidigital number, since it uses as much as digits as its factorization.

12212002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284000090.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12212002021 its reverse (12020021221), we get a palindrome (24232023242).

It can be divided in two parts, 1221200 and 2021, that added together give a palindrome (1223221).

The spelling of 12212002021 in words is "twelve billion, two hundred twelve million, two thousand, twenty-one".