21060312 has 64 divisors (see below), whose sum is σ = 64807680. Its totient is φ = 5553792.

The previous prime is 21060287. The next prime is 21060313. The reversal of 21060312 is 21306012.

It is a junction number, because it is equal to n+sod(n) for n = 21060291 and 21060300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21060313) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2638 + ... + 7005.

It is an arithmetic number, because the mean of its divisors is an integer number (1012620).

Almost surely, 2^21060312 is an apocalyptic number.

It is an amenable number.

21060312 is an abundant number, since it is smaller than the sum of its proper divisors (43747368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21060312 is a wasteful number, since it uses less digits than its factorization.

21060312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9672 (or 9668 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21060312 is about 4589.1515555710. The cubic root of 21060312 is about 276.1562861968.

Adding to 21060312 its reverse (21306012), we get a palindrome (42366324).

The spelling of 21060312 in words is "twenty-one million, sixty thousand, three hundred twelve".