31323212321220 has 192 divisors, whose sum is σ = 98916186378240. Its totient is φ = 8227212529536.

The previous prime is 31323212321189. The next prime is 31323212321333. The reversal of 31323212321220 is 2212321232313.

31323212321220 is a `hidden beast` number, since 3 + 1 + 323 + 2 + 12 + 321 + 2 + 2 + 0 = 666.

It is a super-2 number, since 2×31323212321220² (a number of 28 digits) contains 22 as substring.

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

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, 335812309 + ... + 335905571.

It is an arithmetic number, because the mean of its divisors is an integer number (515188470720).

Almost surely, 2^{31323212321220} is an apocalyptic number.

31323212321220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31323212321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49458093189120).

31323212321220 is an abundant number, since it is smaller than the sum of its proper divisors (67592974057020).

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

31323212321220 is a wasteful number, since it uses less digits than its factorization.

31323212321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102631 (or 102623 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 31323212321220 its reverse (2212321232313), we get a palindrome (33535533553533).

The spelling of 31323212321220 in words is "thirty-one trillion, three hundred twenty-three billion, two hundred twelve million, three hundred twenty-one thousand, two hundred twenty".