31223201112020 has 192 divisors, whose sum is σ = 67106974556160. Its totient is φ = 12201218039808.

The previous prime is 31223201111899. The next prime is 31223201112139. The reversal of 31223201112020 is 2021110232213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31223201111983 and 31223201112001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38594809376 + ... + 38594810184.

It is an arithmetic number, because the mean of its divisors is an integer number (349515492480).

Almost surely, 2^{31223201112020} is an apocalyptic number.

It is an amenable number.

31223201112020 is an abundant number, since it is smaller than the sum of its proper divisors (35883773444140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31223201112020 is a wasteful number, since it uses less digits than its factorization.

31223201112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842 (or 1840 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31223201112020 its reverse (2021110232213), we get a palindrome (33244311344233).

The spelling of 31223201112020 in words is "thirty-one trillion, two hundred twenty-three billion, two hundred one million, one hundred twelve thousand, twenty".