20331431331221 has 8 divisors (see below), whose sum is σ = 20804338911840. Its totient is φ = 19858527550512.

The previous prime is 20331431331163. The next prime is 20331431331241. The reversal of 20331431331221 is 12213313413302.

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 20331431331221 - 2¹⁴ = 20331431314837 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 (20331431331241) 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, 11861795 + ... + 13467183.

It is an arithmetic number, because the mean of its divisors is an integer number (2600542363980).

Almost surely, 2^{20331431331221} is an apocalyptic number.

It is an amenable number.

20331431331221 is a deficient number, since it is larger than the sum of its proper divisors (472907580619).

20331431331221 is a wasteful number, since it uses less digits than its factorization.

20331431331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899955.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 20331431331221 its reverse (12213313413302), we get a palindrome (32544744744523).

The spelling of 20331431331221 in words is "twenty trillion, three hundred thirty-one billion, four hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty-one".