21131411 has 8 divisors (see below), whose sum is σ = 25200384. Its totient is φ = 17325000.

The previous prime is 21131399. The next prime is 21131419. The reversal of 21131411 is 11413112.

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

It is not a de Polignac number, because 21131411 - 2¹⁴ = 21115027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131419) 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, 65465 + ... + 65786.

It is an arithmetic number, because the mean of its divisors is an integer number (3150048).

Almost surely, 2^21131411 is an apocalyptic number.

21131411 is a deficient number, since it is larger than the sum of its proper divisors (4068973).

21131411 is a wasteful number, since it uses less digits than its factorization.

21131411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131281.

The product of its digits is 24, while the sum is 14.

The square root of 21131411 is about 4596.8914496647. The cubic root of 21131411 is about 276.4667023331.

Adding to 21131411 its reverse (11413112), we get a palindrome (32544523).

The spelling of 21131411 in words is "twenty-one million, one hundred thirty-one thousand, four hundred eleven".