31221033340 has 48 divisors (see below), whose sum is σ = 75222124992. Its totient is φ = 10662690816.

The previous prime is 31221033293. The next prime is 31221033343. The reversal of 31221033340 is 4333012213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221033343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397887 + ... + 469846.

It is an arithmetic number, because the mean of its divisors is an integer number (1567127604).

Almost surely, 2^31221033340 is an apocalyptic number.

It is an amenable number.

31221033340 is an abundant number, since it is smaller than the sum of its proper divisors (44001091652).

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

31221033340 is a wasteful number, since it uses less digits than its factorization.

31221033340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868006 (or 868004 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31221033340 its reverse (4333012213), we get a palindrome (35554045553).

The spelling of 31221033340 in words is "thirty-one billion, two hundred twenty-one million, thirty-three thousand, three hundred forty".