2012021220221 has 4 divisors (see below), whose sum is σ = 2014454136672. Its totient is φ = 2009588303772.

The previous prime is 2012021220211. The next prime is 2012021220227. The reversal of 2012021220221 is 1220221202102.

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 a de Polignac number, because none of the positive numbers 2^k-2012021220221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2012021220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012021220227) 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, 1216456985 + ... + 1216458638.

It is an arithmetic number, because the mean of its divisors is an integer number (503613534168).

Almost surely, 2^{2012021220221} is an apocalyptic number.

It is an amenable number.

2012021220221 is a deficient number, since it is larger than the sum of its proper divisors (2432916451).

2012021220221 is an equidigital number, since it uses as much as digits as its factorization.

2012021220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432916450.

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

Adding to 2012021220221 its reverse (1220221202102), we get a palindrome (3232242422323).

The spelling of 2012021220221 in words is "two trillion, twelve billion, twenty-one million, two hundred twenty thousand, two hundred twenty-one".