31221242322220 has 48 divisors (see below), whose sum is σ = 67749733725408. Its totient is φ = 12076424110080.

The previous prime is 31221242322209. The next prime is 31221242322229. The reversal of 31221242322220 is 2222324212213.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31221242322229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129299221 + ... + 129540460.

It is an arithmetic number, because the mean of its divisors is an integer number (1411452785946).

Almost surely, 2^{31221242322220} is an apocalyptic number.

It is an amenable number.

31221242322220 is an abundant number, since it is smaller than the sum of its proper divisors (36528491403188).

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

31221242322220 is a wasteful number, since it uses less digits than its factorization.

31221242322220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258839890 (or 258839888 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 31221242322220 its reverse (2222324212213), we get a palindrome (33443566534433).

The spelling of 31221242322220 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred forty-two million, three hundred twenty-two thousand, two hundred twenty".