20321021311 has 4 divisors (see below), whose sum is σ = 20500853472. Its totient is φ = 20141189152.

The previous prime is 20321021293. The next prime is 20321021321. The reversal of 20321021311 is 11312012302.

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 20321021311 - 2¹¹ = 20321019263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321021321) 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, 89915911 + ... + 89916136.

It is an arithmetic number, because the mean of its divisors is an integer number (5125213368).

Almost surely, 2^20321021311 is an apocalyptic number.

20321021311 is a deficient number, since it is larger than the sum of its proper divisors (179832161).

20321021311 is a wasteful number, since it uses less digits than its factorization.

20321021311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179832160.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20321021311 its reverse (11312012302), we get a palindrome (31633033613).

Subtracting from 20321021311 its reverse (11312012302), we obtain a palindrome (9009009009).

The spelling of 20321021311 in words is "twenty billion, three hundred twenty-one million, twenty-one thousand, three hundred eleven".