21000526730 has 16 divisors (see below), whose sum is σ = 38420636904. Its totient is φ = 8262502080.

The previous prime is 21000526693. The next prime is 21000526741. The reversal of 21000526730 is 3762500012.

It can be written as a sum of positive squares in 4 ways, for example, as 12127075129 + 8873451601 = 110123^2 + 94199^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21000526730.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17212937 + ... + 17214156.

Almost surely, 2^21000526730 is an apocalyptic number.

21000526730 is a deficient number, since it is larger than the sum of its proper divisors (17420110174).

21000526730 is a wasteful number, since it uses less digits than its factorization.

21000526730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34427161.

The product of its (nonzero) digits is 2520, while the sum is 26.

The spelling of 21000526730 in words is "twenty-one billion, five hundred twenty-six thousand, seven hundred thirty".