20331222231221 has 16 divisors (see below), whose sum is σ = 23350120972800. Its totient is φ = 17507696367600.

The previous prime is 20331222231193. The next prime is 20331222231233. The reversal of 20331222231221 is 12213222213302.

It is a cyclic number.

It is not a de Polignac number, because 20331222231221 - 2²⁶ = 20331155122357 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 (20331222231821) 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, 5297915 + ... + 8290376.

It is an arithmetic number, because the mean of its divisors is an integer number (1459382560800).

Almost surely, 2^{20331222231221} is an apocalyptic number.

It is an amenable number.

20331222231221 is a deficient number, since it is larger than the sum of its proper divisors (3018898741579).

20331222231221 is a wasteful number, since it uses less digits than its factorization.

20331222231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13595480.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 20331222231221 its reverse (12213222213302), we get a palindrome (32544444444523).

The spelling of 20331222231221 in words is "twenty trillion, three hundred thirty-one billion, two hundred twenty-two million, two hundred thirty-one thousand, two hundred twenty-one".