21060436 has 24 divisors (see below), whose sum is σ = 39035360. Its totient is φ = 9914400.

The previous prime is 21060421. The next prime is 21060449. The reversal of 21060436 is 63406012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12991 + ... + 14521.

Almost surely, 2^21060436 is an apocalyptic number.

It is an amenable number.

21060436 is a deficient number, since it is larger than the sum of its proper divisors (17974924).

21060436 is a wasteful number, since it uses less digits than its factorization.

21060436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735 (or 1733 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21060436 is about 4589.1650656737. The cubic root of 21060436 is about 276.1568281848.

Adding to 21060436 its reverse (63406012), we get a palindrome (84466448).

The spelling of 21060436 in words is "twenty-one million, sixty thousand, four hundred thirty-six".