20212320323021 has 4 divisors (see below), whose sum is σ = 20242176040572. Its totient is φ = 20182464605472.

The previous prime is 20212320323003. The next prime is 20212320323053. The reversal of 20212320323021 is 12032302321202.

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 12649325314921 + 7562995008100 = 3556589^2 + 2750090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212320323021 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 (20212320323081) 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, 14927857760 + ... + 14927859113.

It is an arithmetic number, because the mean of its divisors is an integer number (5060544010143).

Almost surely, 2^{20212320323021} is an apocalyptic number.

It is an amenable number.

20212320323021 is a deficient number, since it is larger than the sum of its proper divisors (29855717551).

20212320323021 is an equidigital number, since it uses as much as digits as its factorization.

20212320323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29855717550.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20212320323021 its reverse (12032302321202), we get a palindrome (32244622644223).

The spelling of 20212320323021 in words is "twenty trillion, two hundred twelve billion, three hundred twenty million, three hundred twenty-three thousand, twenty-one".