20001321223331 has 16 divisors (see below), whose sum is σ = 23647771765440. Its totient is φ = 16552194892800.

The previous prime is 20001321223241. The next prime is 20001321223337. The reversal of 20001321223331 is 13332212310002.

It is a de Polignac number, because none of the positive numbers 2^k-20001321223331 is a prime.

It is a super-2 number, since 2×20001321223331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001321223297 and 20001321223306.

It is not an unprimeable number, because it can be changed into a prime (20001321223337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3595931 + ... + 7275531.

It is an arithmetic number, because the mean of its divisors is an integer number (1477985735340).

Almost surely, 2^{20001321223331} is an apocalyptic number.

20001321223331 is a deficient number, since it is larger than the sum of its proper divisors (3646450542109).

20001321223331 is a wasteful number, since it uses less digits than its factorization.

20001321223331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706414.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 20001321223331 its reverse (13332212310002), we get a palindrome (33333533533333).

The spelling of 20001321223331 in words is "twenty trillion, one billion, three hundred twenty-one million, two hundred twenty-three thousand, three hundred thirty-one".