20021210221013 has 4 divisors (see below), whose sum is σ = 20024837914560. Its totient is φ = 20017582527468.

The previous prime is 20021210220997. The next prime is 20021210221073. The reversal of 20021210221013 is 31012201212002.

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 20021210221013 - 2⁴ = 20021210220997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021210220982 and 20021210221000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021210221073) 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, 1813838495 + ... + 1813849532.

It is an arithmetic number, because the mean of its divisors is an integer number (5006209478640).

Almost surely, 2^{20021210221013} is an apocalyptic number.

It is an amenable number.

20021210221013 is a deficient number, since it is larger than the sum of its proper divisors (3627693547).

20021210221013 is an equidigital number, since it uses as much as digits as its factorization.

20021210221013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627693546.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20021210221013 its reverse (31012201212002), we get a palindrome (51033411433015).

The spelling of 20021210221013 in words is "twenty trillion, twenty-one billion, two hundred ten million, two hundred twenty-one thousand, thirteen".