20312111013221 has 8 divisors (see below), whose sum is σ = 20389775831040. Its totient is φ = 20234449472112.

The previous prime is 20312111013113. The next prime is 20312111013241. The reversal of 20312111013221 is 12231011121302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312111013221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20312111013193 and 20312111013202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312111013241) 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, 11984156 + ... + 13573658.

It is an arithmetic number, because the mean of its divisors is an integer number (2548721978880).

Almost surely, 2^{20312111013221} is an apocalyptic number.

It is an amenable number.

20312111013221 is a deficient number, since it is larger than the sum of its proper divisors (77664817819).

20312111013221 is a wasteful number, since it uses less digits than its factorization.

20312111013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638355.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20312111013221 its reverse (12231011121302), we get a palindrome (32543122134523).

The spelling of 20312111013221 in words is "twenty trillion, three hundred twelve billion, one hundred eleven million, thirteen thousand, two hundred twenty-one".