20331213221 has 8 divisors (see below), whose sum is σ = 22223605824. Its totient is φ = 18446170720.

The previous prime is 20331213163. The next prime is 20331213247. The reversal of 20331213221 is 12231213302.

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

It is a cyclic number.

It is not a de Polignac number, because 20331213221 - 2¹⁰ = 20331212197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331213193 and 20331213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331213281) 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, 1831736 + ... + 1842801.

It is an arithmetic number, because the mean of its divisors is an integer number (2777950728).

Almost surely, 2^20331213221 is an apocalyptic number.

It is an amenable number.

20331213221 is a deficient number, since it is larger than the sum of its proper divisors (1892392603).

20331213221 is a wasteful number, since it uses less digits than its factorization.

20331213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675051.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20331213221 its reverse (12231213302), we get a palindrome (32562426523).

The spelling of 20331213221 in words is "twenty billion, three hundred thirty-one million, two hundred thirteen thousand, two hundred twenty-one".