21002004530 has 32 divisors (see below), whose sum is σ = 41658369984. Its totient is φ = 7574245056.

The previous prime is 21002004509. The next prime is 21002004553. The reversal of 21002004530 is 3540020012.

It is a junction number, because it is equal to n+sod(n) for n = 21002004499 and 21002004508.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1872944 + ... + 1884123.

It is an arithmetic number, because the mean of its divisors is an integer number (1301824062).

Almost surely, 2^21002004530 is an apocalyptic number.

21002004530 is a deficient number, since it is larger than the sum of its proper divisors (20656365454).

21002004530 is a wasteful number, since it uses less digits than its factorization.

21002004530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3757130.

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 21002004530 its reverse (3540020012), we get a palindrome (24542024542).

The spelling of 21002004530 in words is "twenty-one billion, two million, four thousand, five hundred thirty".