31221241000 has 64 divisors (see below), whose sum is σ = 73225152000. Its totient is φ = 12459873600.

The previous prime is 31221240997. The next prime is 31221241063. The reversal of 31221241000 is 14212213.

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 15 ways as a sum of consecutive naturals, for example, 403441 + ... + 474559.

It is an arithmetic number, because the mean of its divisors is an integer number (1144143000).

Almost surely, 2^31221241000 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 31221241000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36612576000).

31221241000 is an abundant number, since it is smaller than the sum of its proper divisors (42003911000).

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

31221241000 is a wasteful number, since it uses less digits than its factorization.

31221241000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71579 (or 71565 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31221241000 its reverse (14212213), we get a palindrome (31235453213).

The spelling of 31221241000 in words is "thirty-one billion, two hundred twenty-one million, two hundred forty-one thousand".