31221223020004 has 6 divisors (see below), whose sum is σ = 54637140285014. Its totient is φ = 15610611510000.

The previous prime is 31221223019977. The next prime is 31221223020011. The reversal of 31221223020004 is 40002032212213.

It can be written as a sum of positive squares in only one way, i.e., 20051122711104 + 11170100308900 = 4477848^2 + 3342170^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3902652877497 + ... + 3902652877504.

Almost surely, 2^{31221223020004} is an apocalyptic number.

It is an amenable number.

31221223020004 is a deficient number, since it is larger than the sum of its proper divisors (23415917265010).

31221223020004 is a wasteful number, since it uses less digits than its factorization.

31221223020004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7805305755005 (or 7805305755003 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31221223020004 its reverse (40002032212213), we get a palindrome (71223255232217).

The spelling of 31221223020004 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred twenty-three million, twenty thousand, four".