31321103031220 has 48 divisors (see below), whose sum is σ = 65813170187520. Its totient is φ = 12521042722944.

The previous prime is 31321103031131. The next prime is 31321103031221. The reversal of 31321103031220 is 2213030112313.

It is a super-2 number, since 2×31321103031220² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31321103031191 and 31321103031200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321103031221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235361461 + ... + 235494499.

It is an arithmetic number, because the mean of its divisors is an integer number (1371107712240).

Almost surely, 2^{31321103031220} is an apocalyptic number.

It is an amenable number.

31321103031220 is an abundant number, since it is smaller than the sum of its proper divisors (34492067156300).

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

31321103031220 is a wasteful number, since it uses less digits than its factorization.

31321103031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139912 (or 139910 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31321103031220 its reverse (2213030112313), we get a palindrome (33534133143533).

The spelling of 31321103031220 in words is "thirty-one trillion, three hundred twenty-one billion, one hundred three million, thirty-one thousand, two hundred twenty".