21158341 has 4 divisors (see below), whose sum is σ = 21168000. Its totient is φ = 21148684.

The previous prime is 21158329. The next prime is 21158377. The reversal of 21158341 is 14385112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21158341 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 (21158311) 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, 210 + ... + 6508.

It is an arithmetic number, because the mean of its divisors is an integer number (5292000).

Almost surely, 2^21158341 is an apocalyptic number.

It is an amenable number.

21158341 is a deficient number, since it is larger than the sum of its proper divisors (9659).

21158341 is an equidigital number, since it uses as much as digits as its factorization.

21158341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9658.

The product of its digits is 960, while the sum is 25.

The square root of 21158341 is about 4599.8196703784. The cubic root of 21158341 is about 276.5840960994.

The spelling of 21158341 in words is "twenty-one million, one hundred fifty-eight thousand, three hundred forty-one".