21471217411 has 16 divisors (see below), whose sum is σ = 25308794880. Its totient is φ = 17833960800.

The previous prime is 21471217357. The next prime is 21471217421. The reversal of 21471217411 is 11471217412.

It is a cyclic number.

It is not a de Polignac number, because 21471217411 - 2²⁷ = 21336999683 is a prime.

It is a super-2 number, since 2×21471217411² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21471217421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289851 + ... + 356308.

It is an arithmetic number, because the mean of its divisors is an integer number (1581799680).

Almost surely, 2^21471217411 is an apocalyptic number.

21471217411 is a deficient number, since it is larger than the sum of its proper divisors (3837577469).

21471217411 is a wasteful number, since it uses less digits than its factorization.

21471217411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646314.

The product of its digits is 3136, while the sum is 31.

Subtracting from 21471217411 its reverse (11471217412), we obtain a palindrome (9999999999).

The spelling of 21471217411 in words is "twenty-one billion, four hundred seventy-one million, two hundred seventeen thousand, four hundred eleven".