21375411 has 8 divisors (see below), whose sum is σ = 28615104. Its totient is φ = 14193000.

The previous prime is 21375379. The next prime is 21375413. The reversal of 21375411 is 11457312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21375411 - 2⁵ = 21375379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21375413) 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, 13441 + ... + 14946.

It is an arithmetic number, because the mean of its divisors is an integer number (3576888).

Almost surely, 2^21375411 is an apocalyptic number.

21375411 is a deficient number, since it is larger than the sum of its proper divisors (7239693).

21375411 is a wasteful number, since it uses less digits than its factorization.

21375411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28641.

The product of its digits is 840, while the sum is 24.

The square root of 21375411 is about 4623.3549506825. The cubic root of 21375411 is about 277.5267338906.

The spelling of 21375411 in words is "twenty-one million, three hundred seventy-five thousand, four hundred eleven".