21181171484 has 36 divisors (see below), whose sum is σ = 40850976600. Its totient is φ = 9602318880.

The previous prime is 21181171447. The next prime is 21181171537. The reversal of 21181171484 is 48417118112.

It is a super-2 number, since 2×21181171484² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125702 + ... + 241170.

It is an arithmetic number, because the mean of its divisors is an integer number (1134749350).

Almost surely, 2^21181171484 is an apocalyptic number.

It is an amenable number.

21181171484 is a deficient number, since it is larger than the sum of its proper divisors (19669805116).

21181171484 is a wasteful number, since it uses less digits than its factorization.

21181171484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115874 (or 115861 counting only the distinct ones).

The product of its digits is 14336, while the sum is 38.

Adding to 21181171484 its reverse (48417118112), we get a palindrome (69598289596).

The spelling of 21181171484 in words is "twenty-one billion, one hundred eighty-one million, one hundred seventy-one thousand, four hundred eighty-four".