21000104430534 has 24 divisors (see below), whose sum is σ = 45501534388440. Its totient is φ = 6999833560608.

The previous prime is 21000104430479. The next prime is 21000104430551. The reversal of 21000104430534 is 43503440100012.

It is a happy number.

21000104430534 is a `hidden beast` number, since 21 + 0 + 0 + 0 + 104 + 4 + 3 + 0 + 534 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21000104430498 and 21000104430507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16126647 + ... + 17380130.

It is an arithmetic number, because the mean of its divisors is an integer number (1895897266185).

Almost surely, 2^{21000104430534} is an apocalyptic number.

21000104430534 is an abundant number, since it is smaller than the sum of its proper divisors (24501429957906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000104430534 is a wasteful number, since it uses less digits than its factorization.

21000104430534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33541604 (or 33541601 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21000104430534 its reverse (43503440100012), we get a palindrome (64503544530546).

The spelling of 21000104430534 in words is "twenty-one trillion, one hundred four million, four hundred thirty thousand, five hundred thirty-four".