21141313 has 4 divisors (see below), whose sum is σ = 21335380. Its totient is φ = 20947248.

The previous prime is 21141299. The next prime is 21141317. The reversal of 21141313 is 31314112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7354944 + 13786369 = 2712^2 + 3713^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141313 - 2¹³ = 21133121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96870 + ... + 97087.

It is an arithmetic number, because the mean of its divisors is an integer number (5333845).

Almost surely, 2^21141313 is an apocalyptic number.

It is an amenable number.

21141313 is a deficient number, since it is larger than the sum of its proper divisors (194067).

21141313 is a wasteful number, since it uses less digits than its factorization.

21141313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194066.

The product of its digits is 72, while the sum is 16.

The square root of 21141313 is about 4597.9683556980. The cubic root of 21141313 is about 276.5098789072.

Adding to 21141313 its reverse (31314112), we get a palindrome (52455425).

The spelling of 21141313 in words is "twenty-one million, one hundred forty-one thousand, three hundred thirteen".