21171411 has 12 divisors (see below), whose sum is σ = 30737200. Its totient is φ = 14042160.

The previous prime is 21171407. The next prime is 21171461. The reversal of 21171411 is 11417112.

It is not a de Polignac number, because 21171411 - 2² = 21171407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21171401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4120 + ... + 7701.

Almost surely, 2^21171411 is an apocalyptic number.

21171411 is a deficient number, since it is larger than the sum of its proper divisors (9565789).

21171411 is a wasteful number, since it uses less digits than its factorization.

21171411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12026 (or 12023 counting only the distinct ones).

The product of its digits is 56, while the sum is 18.

The square root of 21171411 is about 4601.2401589137. The cubic root of 21171411 is about 276.6410351894.

Adding to 21171411 its reverse (11417112), we get a palindrome (32588523).

The spelling of 21171411 in words is "twenty-one million, one hundred seventy-one thousand, four hundred eleven".