21060308 has 6 divisors (see below), whose sum is σ = 36855546. Its totient is φ = 10530152.

The previous prime is 21060287. The next prime is 21060313. The reversal of 21060308 is 80306012.

It can be written as a sum of positive squares in only one way, i.e., 20539024 + 521284 = 4532^2 + 722^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21060308.

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 as a sum of consecutive naturals, namely, 2632535 + ... + 2632542.

It is an arithmetic number, because the mean of its divisors is an integer number (6142591).

Almost surely, 2^21060308 is an apocalyptic number.

It is an amenable number.

21060308 is a deficient number, since it is larger than the sum of its proper divisors (15795238).

21060308 is a wasteful number, since it uses less digits than its factorization.

21060308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5265081 (or 5265079 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21060308 is about 4589.1511197606. The cubic root of 21060308 is about 276.1562687132.

The spelling of 21060308 in words is "twenty-one million, sixty thousand, three hundred eight".