31221223004130 has 32 divisors (see below), whose sum is σ = 75618374990400. Its totient is φ = 8249277269952.

The previous prime is 31221223004093. The next prime is 31221223004141. The reversal of 31221223004130 is 3140032212213.

It is a self number, because there is not a number n which added to its sum of digits gives 31221223004130.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4773884040 + ... + 4773890579.

It is an arithmetic number, because the mean of its divisors is an integer number (2363074218450).

Almost surely, 2^{31221223004130} is an apocalyptic number.

31221223004130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31221223004130 is an abundant number, since it is smaller than the sum of its proper divisors (44397151986270).

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

31221223004130 is a wasteful number, since it uses less digits than its factorization.

31221223004130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9547774738.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 31221223004130 its reverse (3140032212213), we get a palindrome (34361255216343).

The spelling of 31221223004130 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred twenty-three million, four thousand, one hundred thirty".