20001213331 has 4 divisors (see below), whose sum is σ = 21819505464. Its totient is φ = 18182921200.

The previous prime is 20001213329. The next prime is 20001213343. The reversal of 20001213331 is 13331210002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20001213331 - 2¹ = 20001213329 is a prime.

It is a super-2 number, since 2×20001213331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001213301) 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, 909146050 + ... + 909146071.

It is an arithmetic number, because the mean of its divisors is an integer number (5454876366).

Almost surely, 2^20001213331 is an apocalyptic number.

20001213331 is a deficient number, since it is larger than the sum of its proper divisors (1818292133).

20001213331 is a wasteful number, since it uses less digits than its factorization.

20001213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818292132.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20001213331 its reverse (13331210002), we get a palindrome (33332423333).

It can be divided in two parts, 20001 and 213331, that added together give a palindrome (233332).

The spelling of 20001213331 in words is "twenty billion, one million, two hundred thirteen thousand, three hundred thirty-one".