20331212221031 has 4 divisors (see below), whose sum is σ = 20345641755600. Its totient is φ = 20316782686464.

The previous prime is 20331212220971. The next prime is 20331212221049. The reversal of 20331212221031 is 13012221213302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20331212221031 - 2⁶ = 20331212220967 is a prime.

It is a super-2 number, since 2×20331212221031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331212220988 and 20331212221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331212221531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7214765171 + ... + 7214767988.

It is an arithmetic number, because the mean of its divisors is an integer number (5086410438900).

Almost surely, 2^{20331212221031} is an apocalyptic number.

20331212221031 is a deficient number, since it is larger than the sum of its proper divisors (14429534569).

20331212221031 is a wasteful number, since it uses less digits than its factorization.

20331212221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14429534568.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20331212221031 its reverse (13012221213302), we get a palindrome (33343433434333).

The spelling of 20331212221031 in words is "twenty trillion, three hundred thirty-one billion, two hundred twelve million, two hundred twenty-one thousand, thirty-one".