20331312221201 has 4 divisors (see below), whose sum is σ = 20353435521600. Its totient is φ = 20309188920804.

The previous prime is 20331312221153. The next prime is 20331312221219. The reversal of 20331312221201 is 10212221313302.

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 a de Polignac number, because none of the positive numbers 2^k-20331312221201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20331312221291) 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, 11061648821 + ... + 11061650658.

It is an arithmetic number, because the mean of its divisors is an integer number (5088358880400).

Almost surely, 2^{20331312221201} is an apocalyptic number.

It is an amenable number.

20331312221201 is a deficient number, since it is larger than the sum of its proper divisors (22123300399).

20331312221201 is an equidigital number, since it uses as much as digits as its factorization.

20331312221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22123300398.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20331312221201 its reverse (10212221313302), we get a palindrome (30543533534503).

The spelling of 20331312221201 in words is "twenty trillion, three hundred thirty-one billion, three hundred twelve million, two hundred twenty-one thousand, two hundred one".