20212212200221 has 4 divisors (see below), whose sum is σ = 20212242216444. Its totient is φ = 20212182184000.

The previous prime is 20212212200197. The next prime is 20212212200237. The reversal of 20212212200221 is 12200221221202.

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 17342135743321 + 2870076456900 = 4164389^2 + 1694130^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212212200221 - 2¹⁹ = 20212211675933 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 (20212212209221) 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, 13974310 + ... + 15352711.

It is an arithmetic number, because the mean of its divisors is an integer number (5053060554111).

Almost surely, 2^{20212212200221} is an apocalyptic number.

It is an amenable number.

20212212200221 is a deficient number, since it is larger than the sum of its proper divisors (30016223).

20212212200221 is an equidigital number, since it uses as much as digits as its factorization.

20212212200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30016222.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20212212200221 its reverse (12200221221202), we get a palindrome (32412433421423).

The spelling of 20212212200221 in words is "twenty trillion, two hundred twelve billion, two hundred twelve million, two hundred thousand, two hundred twenty-one".