20121031210 has 24 divisors (see below), whose sum is σ = 42130976580. Its totient is φ = 6898639104.

The previous prime is 20121031159. The next prime is 20121031211. The reversal of 20121031210 is 1213012102.

It can be written as a sum of positive squares in 2 ways, for example, as 19598040049 + 522991161 = 139993^2 + 22869^2 .

It is not an unprimeable number, because it can be changed into a prime (20121031211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20531175 + ... + 20532154.

Almost surely, 2^20121031210 is an apocalyptic number.

20121031210 is an abundant number, since it is smaller than the sum of its proper divisors (22009945370).

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

20121031210 is a wasteful number, since it uses less digits than its factorization.

20121031210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41063350 (or 41063343 counting only the distinct ones).

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

Adding to 20121031210 its reverse (1213012102), we get a palindrome (21334043312).

The spelling of 20121031210 in words is "twenty billion, one hundred twenty-one million, thirty-one thousand, two hundred ten".