21313012 has 12 divisors (see below), whose sum is σ = 42626080. Its totient is φ = 9134136.

The previous prime is 21313001. The next prime is 21313021. The reversal of 21313012 is 21031312.

21313012 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21312983 and 21313001.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 380562 + ... + 380617.

Almost surely, 2^21313012 is an apocalyptic number.

It is an amenable number.

21313012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21313012 is a wasteful number, since it uses less digits than its factorization.

21313012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761190 (or 761188 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21313012 is about 4616.6017805308. The cubic root of 21313012 is about 277.2564191039.

Adding to 21313012 its reverse (21031312), we get a palindrome (42344324).

It can be divided in two parts, 213 and 13012, that added together give a square (13225 = 115²).

The spelling of 21313012 in words is "twenty-one million, three hundred thirteen thousand, twelve".