20413213221 has 16 divisors (see below), whose sum is σ = 27313677248. Its totient is φ = 13560825600.

The previous prime is 20413213189. The next prime is 20413213273. The reversal of 20413213221 is 12231231402.

It is not a de Polignac number, because 20413213221 - 2⁵ = 20413213189 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 (20413213421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2240886 + ... + 2249976.

It is an arithmetic number, because the mean of its divisors is an integer number (1707104828).

Almost surely, 2^20413213221 is an apocalyptic number.

It is an amenable number.

20413213221 is a deficient number, since it is larger than the sum of its proper divisors (6900464027).

20413213221 is a wasteful number, since it uses less digits than its factorization.

20413213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11652.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20413213221 its reverse (12231231402), we get a palindrome (32644444623).

The spelling of 20413213221 in words is "twenty billion, four hundred thirteen million, two hundred thirteen thousand, two hundred twenty-one".