21010412530 has 16 divisors (see below), whose sum is σ = 37847395224. Its totient is φ = 8397797760.

The previous prime is 21010412497. The next prime is 21010412543. The reversal of 21010412530 is 3521401012.

It can be written as a sum of positive squares in 4 ways, for example, as 15300947809 + 5709464721 = 123697^2 + 75561^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21010412498 and 21010412507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 782037 + ... + 808456.

Almost surely, 2^21010412530 is an apocalyptic number.

21010412530 is a deficient number, since it is larger than the sum of its proper divisors (16836982694).

21010412530 is a wasteful number, since it uses less digits than its factorization.

21010412530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591821.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21010412530 its reverse (3521401012), we get a palindrome (24531813542).

The spelling of 21010412530 in words is "twenty-one billion, ten million, four hundred twelve thousand, five hundred thirty".