20213220321 has 24 divisors (see below), whose sum is σ = 33371991744. Its totient is φ = 11548980000.

The previous prime is 20213220311. The next prime is 20213220323. The reversal of 20213220321 is 12302231202.

20213220321 is a `hidden beast` number, since 2 + 0 + 21 + 322 + 0 + 321 = 666.

It is not a de Polignac number, because 20213220321 - 2⁶ = 20213220257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20213220294 and 20213220303.

It is not an unprimeable number, because it can be changed into a prime (20213220323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 694555 + ... + 723071.

It is an arithmetic number, because the mean of its divisors is an integer number (1390499656).

Almost surely, 2^20213220321 is an apocalyptic number.

20213220321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20213220321 is a deficient number, since it is larger than the sum of its proper divisors (13158771423).

20213220321 is a wasteful number, since it uses less digits than its factorization.

20213220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39781 (or 39778 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20213220321 its reverse (12302231202), we get a palindrome (32515451523).

The spelling of 20213220321 in words is "twenty billion, two hundred thirteen million, two hundred twenty thousand, three hundred twenty-one".