20321122421 has 4 divisors (see below), whose sum is σ = 21390655200. Its totient is φ = 19251589644.

The previous prime is 20321122373. The next prime is 20321122441. The reversal of 20321122421 is 12422112302.

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 not a de Polignac number, because 20321122421 - 2¹⁰ = 20321121397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20321122393 and 20321122402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321122441) 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, 534766361 + ... + 534766398.

It is an arithmetic number, because the mean of its divisors is an integer number (5347663800).

Almost surely, 2^20321122421 is an apocalyptic number.

It is an amenable number.

20321122421 is a deficient number, since it is larger than the sum of its proper divisors (1069532779).

20321122421 is a wasteful number, since it uses less digits than its factorization.

20321122421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069532778.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20321122421 its reverse (12422112302), we get a palindrome (32743234723).

The spelling of 20321122421 in words is "twenty billion, three hundred twenty-one million, one hundred twenty-two thousand, four hundred twenty-one".