31023222132 has 96 divisors (see below), whose sum is σ = 85874503680. Its totient is φ = 8532904320.

The previous prime is 31023222121. The next prime is 31023222199. The reversal of 31023222132 is 23122232013.

It is a happy number.

It is a super-2 number, since 2×31023222132² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 31023222099 and 31023222108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176419 + ... + 305237.

It is an arithmetic number, because the mean of its divisors is an integer number (894526080).

Almost surely, 2^31023222132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31023222132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42937251840).

31023222132 is an abundant number, since it is smaller than the sum of its proper divisors (54851281548).

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

31023222132 is a wasteful number, since it uses less digits than its factorization.

31023222132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128941 (or 128939 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31023222132 its reverse (23122232013), we get a palindrome (54145454145).

The spelling of 31023222132 in words is "thirty-one billion, twenty-three million, two hundred twenty-two thousand, one hundred thirty-two".