20121131012 has 12 divisors (see below), whose sum is σ = 35220751440. Its totient is φ = 10058059176.

The previous prime is 20121130999. The next prime is 20121131053. The reversal of 20121131012 is 21013112102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608462 + ... + 640677.

It is an arithmetic number, because the mean of its divisors is an integer number (2935062620).

Almost surely, 2^20121131012 is an apocalyptic number.

It is an amenable number.

20121131012 is a deficient number, since it is larger than the sum of its proper divisors (15099620428).

20121131012 is a wasteful number, since it uses less digits than its factorization.

20121131012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253170 (or 1253168 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20121131012 its reverse (21013112102), we get a palindrome (41134243114).

The spelling of 20121131012 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-one thousand, twelve".