21313013 has 8 divisors (see below), whose sum is σ = 21593088. Its totient is φ = 21034944.

The previous prime is 21313001. The next prime is 21313021. The reversal of 21313013 is 31031312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21313013 - 2²⁰ = 20264437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35645 + ... + 36237.

It is an arithmetic number, because the mean of its divisors is an integer number (2699136).

Almost surely, 2^21313013 is an apocalyptic number.

It is an amenable number.

21313013 is a deficient number, since it is larger than the sum of its proper divisors (280075).

21313013 is a wasteful number, since it uses less digits than its factorization.

21313013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 21313013 is about 4616.6018888356. The cubic root of 21313013 is about 277.2564234401.

Adding to 21313013 its reverse (31031312), we get a palindrome (52344325).

The spelling of 21313013 in words is "twenty-one million, three hundred thirteen thousand, thirteen".