20121131043 has 36 divisors (see below), whose sum is σ = 33127955640. Its totient is φ = 11730521088.

The previous prime is 20121130999. The next prime is 20121131053. The reversal of 20121131043 is 34013112102.

It is not a de Polignac number, because 20121131043 - 2⁸ = 20121130787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121131053) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 319230 + ... + 377027.

It is an arithmetic number, because the mean of its divisors is an integer number (920220990).

Almost surely, 2^20121131043 is an apocalyptic number.

20121131043 is a deficient number, since it is larger than the sum of its proper divisors (13006824597).

20121131043 is a wasteful number, since it uses less digits than its factorization.

20121131043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696308 (or 696292 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20121131043 its reverse (34013112102), we get a palindrome (54134243145).

The spelling of 20121131043 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-one thousand, forty-three".