21050310 has 32 divisors (see below), whose sum is σ = 50653152. Its totient is φ = 5598720.

The previous prime is 21050303. The next prime is 21050311. The reversal of 21050310 is 1305012.

It is a super-2 number, since 2×21050310² = 886231102192200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050311) 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, 15582 + ... + 16878.

It is an arithmetic number, because the mean of its divisors is an integer number (1582911).

Almost surely, 2^21050310 is an apocalyptic number.

21050310 is an abundant number, since it is smaller than the sum of its proper divisors (29602842).

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

21050310 is a wasteful number, since it uses less digits than its factorization.

21050310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 21050310 is about 4588.0616822358. The cubic root of 21050310 is about 276.1125617329.

Adding to 21050310 its reverse (1305012), we get a palindrome (22355322).

The spelling of 21050310 in words is "twenty-one million, fifty thousand, three hundred ten".