21132313 has 8 divisors (see below), whose sum is σ = 22334400. Its totient is φ = 19939248.

The previous prime is 21132311. The next prime is 21132317. The reversal of 21132313 is 31323112.

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 21132313 - 2¹ = 21132311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21132311) 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, 2883 + ... + 7111.

It is an arithmetic number, because the mean of its divisors is an integer number (2791800).

Almost surely, 2^21132313 is an apocalyptic number.

It is an amenable number.

21132313 is a deficient number, since it is larger than the sum of its proper divisors (1202087).

21132313 is a wasteful number, since it uses less digits than its factorization.

21132313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511.

The product of its digits is 108, while the sum is 16.

The square root of 21132313 is about 4596.9895583958. The cubic root of 21132313 is about 276.4706359625.

Adding to 21132313 its reverse (31323112), we get a palindrome (52455425).

The spelling of 21132313 in words is "twenty-one million, one hundred thirty-two thousand, three hundred thirteen".