31010221012 has 6 divisors (see below), whose sum is σ = 54267886778. Its totient is φ = 15505110504.

The previous prime is 31010221007. The next prime is 31010221013. The reversal of 31010221012 is 21012201013.

It can be written as a sum of positive squares in only one way, i.e., 28914961936 + 2095259076 = 170044^2 + 45774^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31010220983 and 31010221001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31010221013) by changing a digit.

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 as a sum of consecutive naturals, namely, 3876277623 + ... + 3876277630.

Almost surely, 2^31010221012 is an apocalyptic number.

It is an amenable number.

31010221012 is a deficient number, since it is larger than the sum of its proper divisors (23257665766).

31010221012 is a wasteful number, since it uses less digits than its factorization.

31010221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7752555257 (or 7752555255 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 31010221012 its reverse (21012201013), we get a palindrome (52022422025).

The spelling of 31010221012 in words is "thirty-one billion, ten million, two hundred twenty-one thousand, twelve".