21313036 has 48 divisors (see below), whose sum is σ = 41713056. Its totient is φ = 9483264.

The previous prime is 21313021. The next prime is 21313037. The reversal of 21313036 is 63031312.

It is not an unprimeable number, because it can be changed into a prime (21313037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108090 + ... + 108286.

It is an arithmetic number, because the mean of its divisors is an integer number (869022).

Almost surely, 2^21313036 is an apocalyptic number.

It is an amenable number.

21313036 is a deficient number, since it is larger than the sum of its proper divisors (20400020).

21313036 is a wasteful number, since it uses less digits than its factorization.

21313036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 21313036 is about 4616.6043798446. The cubic root of 21313036 is about 277.2565231741.

Adding to 21313036 its reverse (63031312), we get a palindrome (84344348).

It can be divided in two parts, 21 and 313036, that multiplied together give a palindrome (6573756).

The spelling of 21313036 in words is "twenty-one million, three hundred thirteen thousand, thirty-six".