21341087 has 4 divisors (see below), whose sum is σ = 21494760. Its totient is φ = 21187416.

The previous prime is 21341083. The next prime is 21341093. The reversal of 21341087 is 78014312.

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

It is a cyclic number.

It is not a de Polignac number, because 21341087 - 2² = 21341083 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 (21341081) 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, 76628 + ... + 76905.

It is an arithmetic number, because the mean of its divisors is an integer number (5373690).

Almost surely, 2^21341087 is an apocalyptic number.

21341087 is a deficient number, since it is larger than the sum of its proper divisors (153673).

21341087 is a wasteful number, since it uses less digits than its factorization.

21341087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153672.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21341087 is about 4619.6414363022. The cubic root of 21341087 is about 277.3781062466.

Adding to 21341087 its reverse (78014312), we get a palindrome (99355399).

The spelling of 21341087 in words is "twenty-one million, three hundred forty-one thousand, eighty-seven".