21313016 has 8 divisors (see below), whose sum is σ = 39961920. Its totient is φ = 10656504.

The previous prime is 21313001. The next prime is 21313021. The reversal of 21313016 is 61031312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21312985 and 21313003.

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 as a sum of consecutive naturals, namely, 1332056 + ... + 1332071.

It is an arithmetic number, because the mean of its divisors is an integer number (4995240).

Almost surely, 2^21313016 is an apocalyptic number.

It is an amenable number.

21313016 is a deficient number, since it is larger than the sum of its proper divisors (18648904).

21313016 is a wasteful number, since it uses less digits than its factorization.

21313016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664133 (or 2664129 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21313016 is about 4616.6022137498. The cubic root of 21313016 is about 277.2564364489.

Adding to 21313016 its reverse (61031312), we get a palindrome (82344328).

The spelling of 21313016 in words is "twenty-one million, three hundred thirteen thousand, sixteen".