20212233221021 has 4 divisors (see below), whose sum is σ = 20212416126972. Its totient is φ = 20212050315072.

The previous prime is 20212233220957. The next prime is 20212233221057. The reversal of 20212233221021 is 12012233221202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15652001100121 + 4560232120900 = 3956261^2 + 2135470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212233221021 - 2⁶ = 20212233220957 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 (20212233221221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91287116 + ... + 91508261.

It is an arithmetic number, because the mean of its divisors is an integer number (5053104031743).

Almost surely, 2^{20212233221021} is an apocalyptic number.

It is an amenable number.

20212233221021 is a deficient number, since it is larger than the sum of its proper divisors (182905951).

20212233221021 is a wasteful number, since it uses less digits than its factorization.

20212233221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182905950.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20212233221021 its reverse (12012233221202), we get a palindrome (32224466442223).

The spelling of 20212233221021 in words is "twenty trillion, two hundred twelve billion, two hundred thirty-three million, two hundred twenty-one thousand, twenty-one".