31221220223230 has 64 divisors (see below), whose sum is σ = 58261911180480. Its totient is φ = 12036278467584.

The previous prime is 31221220223227. The next prime is 31221220223261. The reversal of 31221220223230 is 3232202212213.

It is a junction number, because it is equal to n+sod(n) for n = 31221220223195 and 31221220223204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 515946216 + ... + 516006724.

It is an arithmetic number, because the mean of its divisors is an integer number (910342362195).

Almost surely, 2^{31221220223230} is an apocalyptic number.

31221220223230 is a deficient number, since it is larger than the sum of its proper divisors (27040690957250).

31221220223230 is a wasteful number, since it uses less digits than its factorization.

31221220223230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73693.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 31221220223230 its reverse (3232202212213), we get a palindrome (34453422435443).

The spelling of 31221220223230 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty-three thousand, two hundred thirty".