21004241530 has 16 divisors (see below), whose sum is σ = 37814190984. Its totient is φ = 8400239680.

The previous prime is 21004241521. The next prime is 21004241537. The reversal of 21004241530 is 3514240012.

It can be written as a sum of positive squares in 4 ways, for example, as 19888614729 + 1115626801 = 141027^2 + 33401^2 .

It is not an unprimeable number, because it can be changed into a prime (21004241537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120577 + ... + 237796.

Almost surely, 2^21004241530 is an apocalyptic number.

21004241530 is a deficient number, since it is larger than the sum of its proper divisors (16809949454).

21004241530 is a wasteful number, since it uses less digits than its factorization.

21004241530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364241.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21004241530 its reverse (3514240012), we get a palindrome (24518481542).

The spelling of 21004241530 in words is "twenty-one billion, four million, two hundred forty-one thousand, five hundred thirty".