20021320320001 has 64 divisors (see below), whose sum is σ = 27273539414016. Its totient is φ = 14191940736000.

The previous prime is 20021320319983. The next prime is 20021320320013. The reversal of 20021320320001 is 10002302312002.

It is a cyclic number.

It is not a de Polignac number, because 20021320320001 - 2¹³ = 20021320311809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021320320061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33015810 + ... + 33616756.

It is an arithmetic number, because the mean of its divisors is an integer number (426149053344).

Almost surely, 2^{20021320320001} is an apocalyptic number.

It is an amenable number.

20021320320001 is a deficient number, since it is larger than the sum of its proper divisors (7252219094015).

20021320320001 is a wasteful number, since it uses less digits than its factorization.

20021320320001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601462.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20021320320001 its reverse (10002302312002), we get a palindrome (30023622632003).

The spelling of 20021320320001 in words is "twenty trillion, twenty-one billion, three hundred twenty million, three hundred twenty thousand, one".