12220012021 has 4 divisors (see below), whose sum is σ = 13965728032. Its totient is φ = 10474296012.

The previous prime is 12220012019. The next prime is 12220012043. The reversal of 12220012021 is 12021002221.

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: 12021002221 = 16103 ⋅746507.

It is a cyclic number.

It is not a de Polignac number, because 12220012021 - 2¹ = 12220012019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12220011992 and 12220012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220013021) 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, 872857995 + ... + 872858008.

It is an arithmetic number, because the mean of its divisors is an integer number (3491432008).

Almost surely, 2^12220012021 is an apocalyptic number.

It is an amenable number.

12220012021 is a deficient number, since it is larger than the sum of its proper divisors (1745716011).

12220012021 is an equidigital number, since it uses as much as digits as its factorization.

12220012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745716010.

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

Adding to 12220012021 its reverse (12021002221), we get a palindrome (24241014242).

The spelling of 12220012021 in words is "twelve billion, two hundred twenty million, twelve thousand, twenty-one".