21004031031112 has 16 divisors (see below), whose sum is σ = 39499420378860. Its totient is φ = 10470852263424.

The previous prime is 21004031031107. The next prime is 21004031031143. The reversal of 21004031031112 is 21113013040012.

It can be written as a sum of positive squares in 2 ways, for example, as 19899753715396 + 1104277315716 = 4460914^2 + 1050846^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21004031031112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3895403653 + ... + 3895409044.

Almost surely, 2^{21004031031112} is an apocalyptic number.

It is an amenable number.

21004031031112 is a deficient number, since it is larger than the sum of its proper divisors (18495389347748).

21004031031112 is a wasteful number, since it uses less digits than its factorization.

21004031031112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7790813040 (or 7790813036 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21004031031112 its reverse (21113013040012), we get a palindrome (42117044071124).

The spelling of 21004031031112 in words is "twenty-one trillion, four billion, thirty-one million, thirty-one thousand, one hundred twelve".