20121131042 has 8 divisors (see below), whose sum is σ = 30182780496. Its totient is φ = 10060204212.

The previous prime is 20121130999. The next prime is 20121131053. The reversal of 20121131042 is 24013112102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20121131042.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104648 + ... + 226259.

It is an arithmetic number, because the mean of its divisors is an integer number (3772847562).

Almost surely, 2^20121131042 is an apocalyptic number.

20121131042 is a deficient number, since it is larger than the sum of its proper divisors (10061649454).

20121131042 is a wasteful number, since it uses less digits than its factorization.

20121131042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361312.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20121131042 its reverse (24013112102), we get a palindrome (44134243144).

The spelling of 20121131042 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-one thousand, forty-two".