20001321011 has 8 divisors (see below), whose sum is σ = 22874461440. Its totient is φ = 17132132808.

The previous prime is 20001321001. The next prime is 20001321017. The reversal of 20001321011 is 11012310002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20001321011 - 2¹⁸ = 20001058867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001320983 and 20001321001.

It is not an unprimeable number, because it can be changed into a prime (20001321017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 977201 + ... + 997458.

It is an arithmetic number, because the mean of its divisors is an integer number (2859307680).

Almost surely, 2^20001321011 is an apocalyptic number.

20001321011 is a deficient number, since it is larger than the sum of its proper divisors (2873140429).

20001321011 is a wasteful number, since it uses less digits than its factorization.

20001321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976113.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20001321011 its reverse (11012310002), we get a palindrome (31013631013).

The spelling of 20001321011 in words is "twenty billion, one million, three hundred twenty-one thousand, eleven".