21050312 has 16 divisors (see below), whose sum is σ = 39519900. Its totient is φ = 10511680.

The previous prime is 21050311. The next prime is 21050339. The reversal of 21050312 is 21305012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13942756 + 7107556 = 3734^2 + 2666^2 .

It is not an unprimeable number, because it can be changed into a prime (21050311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8762 + ... + 10902.

Almost surely, 2^21050312 is an apocalyptic number.

It is an amenable number.

21050312 is a deficient number, since it is larger than the sum of its proper divisors (18469588).

21050312 is a wasteful number, since it uses less digits than its factorization.

21050312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376 (or 3372 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21050312 is about 4588.0619001927. The cubic root of 21050312 is about 276.1125704774.

Adding to 21050312 its reverse (21305012), we get a palindrome (42355324).

The spelling of 21050312 in words is "twenty-one million, fifty thousand, three hundred twelve".