21004203112 has 8 divisors (see below), whose sum is σ = 39382880850. Its totient is φ = 10502101552.

The previous prime is 21004203089. The next prime is 21004203149. The reversal of 21004203112 is 21130240012.

It can be written as a sum of positive squares in only one way, i.e., 20971094596 + 33108516 = 144814^2 + 5754^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312762687 + ... + 1312762702.

Almost surely, 2^21004203112 is an apocalyptic number.

It is an amenable number.

21004203112 is a deficient number, since it is larger than the sum of its proper divisors (18378677738).

21004203112 is a wasteful number, since it uses less digits than its factorization.

21004203112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625525395 (or 2625525391 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21004203112 its reverse (21130240012), we get a palindrome (42134443124).

The spelling of 21004203112 in words is "twenty-one billion, four million, two hundred three thousand, one hundred twelve".