31221001130 has 32 divisors (see below), whose sum is σ = 61597291968. Its totient is φ = 11299276800.

The previous prime is 31221001087. The next prime is 31221001157. The reversal of 31221001130 is 3110012213.

It is a super-2 number, since 2×31221001130² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649367 + ... + 695786.

It is an arithmetic number, because the mean of its divisors is an integer number (1924915374).

Almost surely, 2^31221001130 is an apocalyptic number.

31221001130 is a deficient number, since it is larger than the sum of its proper divisors (30376290838).

31221001130 is a wasteful number, since it uses less digits than its factorization.

31221001130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345382.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31221001130 its reverse (3110012213), we get a palindrome (34331013343).

The spelling of 31221001130 in words is "thirty-one billion, two hundred twenty-one million, one thousand, one hundred thirty".