12021202120021 has 4 divisors (see below), whose sum is σ = 12021229652544. Its totient is φ = 12021174587500.

The previous prime is 12021202120013. The next prime is 12021202120051. The reversal of 12021202120021 is 12002120212021.

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 12021202120021 - 2³ = 12021202120013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021202119977 and 12021202120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021202120001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13100605 + ... + 13988146.

It is an arithmetic number, because the mean of its divisors is an integer number (3005307413136).

Almost surely, 2^{12021202120021} is an apocalyptic number.

It is an amenable number.

12021202120021 is a deficient number, since it is larger than the sum of its proper divisors (27532523).

12021202120021 is an equidigital number, since it uses as much as digits as its factorization.

12021202120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27532522.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12021202120021 its reverse (12002120212021), we get a palindrome (24023322332042).

The spelling of 12021202120021 in words is "twelve trillion, twenty-one billion, two hundred two million, one hundred twenty thousand, twenty-one".