21411385 has 8 divisors (see below), whose sum is σ = 27046080. Its totient is φ = 16227504.

The previous prime is 21411361. The next prime is 21411407. The reversal of 21411385 is 58311412.

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 21411385 - 2²¹ = 19314233 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112597 + ... + 112786.

It is an arithmetic number, because the mean of its divisors is an integer number (3380760).

Almost surely, 2^21411385 is an apocalyptic number.

It is an amenable number.

21411385 is a deficient number, since it is larger than the sum of its proper divisors (5634695).

21411385 is a wasteful number, since it uses less digits than its factorization.

21411385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225407.

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

The square root of 21411385 is about 4627.2437800488. The cubic root of 21411385 is about 277.6823355958.

Adding to 21411385 its reverse (58311412), we get a palindrome (79722797).

The spelling of 21411385 in words is "twenty-one million, four hundred eleven thousand, three hundred eighty-five".