21313010 has 16 divisors (see below), whose sum is σ = 38517336. Its totient is φ = 8491008.

The previous prime is 21313001. The next prime is 21313021. The reversal of 21313010 is 1031312.

It can be written as a sum of positive squares in 4 ways, for example, as 19651489 + 1661521 = 4433^2 + 1289^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21312982 and 21313000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577 + ... + 6716.

Almost surely, 2^21313010 is an apocalyptic number.

21313010 is a deficient number, since it is larger than the sum of its proper divisors (17204326).

21313010 is a wasteful number, since it uses less digits than its factorization.

21313010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8557.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21313010 is about 4616.6015639212. The cubic root of 21313010 is about 277.2564104313.

Adding to 21313010 its reverse (1031312), we get a palindrome (22344322).

The spelling of 21313010 in words is "twenty-one million, three hundred thirteen thousand, ten".