12220021220021 has 4 divisors (see below), whose sum is σ = 12241422308544. Its totient is φ = 12198620131500.

The previous prime is 12220021219961. The next prime is 12220021220027. The reversal of 12220021220021 is 12002212002221.

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.

It is a cyclic number.

It is not a de Polignac number, because 12220021220021 - 2¹⁰ = 12220021218997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220021220027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10700543405 + ... + 10700544546.

It is an arithmetic number, because the mean of its divisors is an integer number (3060355577136).

Almost surely, 2^{12220021220021} is an apocalyptic number.

It is an amenable number.

12220021220021 is a deficient number, since it is larger than the sum of its proper divisors (21401088523).

12220021220021 is an equidigital number, since it uses as much as digits as its factorization.

12220021220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21401088522.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12220021220021 its reverse (12002212002221), we get a palindrome (24222233222242).

The spelling of 12220021220021 in words is "twelve trillion, two hundred twenty billion, twenty-one million, two hundred twenty thousand, twenty-one".