31231121332230 has 128 divisors (see below), whose sum is σ = 84081583180800. Its totient is φ = 8248547768832.

The previous prime is 31231121332207. The next prime is 31231121332277. The reversal of 31231121332230 is 3223312113213.

31231121332230 is a `hidden beast` number, since 3 + 1 + 2 + 311 + 21 + 3 + 322 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31231121332194 and 31231121332203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41332761 + ... + 42081579.

It is an arithmetic number, because the mean of its divisors is an integer number (656887368600).

Almost surely, 2^{31231121332230} is an apocalyptic number.

31231121332230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31231121332230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42040791590400).

31231121332230 is an abundant number, since it is smaller than the sum of its proper divisors (52850461848570).

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

31231121332230 is a wasteful number, since it uses less digits than its factorization.

31231121332230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750315 (or 750309 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 31231121332230 its reverse (3223312113213), we get a palindrome (34454433445443).

The spelling of 31231121332230 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty-one million, three hundred thirty-two thousand, two hundred thirty".