21411531531 has 12 divisors (see below), whose sum is σ = 33306827008. Its totient is φ = 13176327024.

The previous prime is 21411531529. The next prime is 21411531539. The reversal of 21411531531 is 13513511412.

21411531531 is a `hidden beast` number, since 2 + 14 + 115 + 3 + 1 + 531 = 666.

It is not a de Polignac number, because 21411531531 - 2¹ = 21411531529 is a prime.

It is a super-2 number, since 2×21411531531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21411531495 and 21411531504.

It is not an unprimeable number, because it can be changed into a prime (21411531539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91502155 + ... + 91502388.

Almost surely, 2^21411531531 is an apocalyptic number.

21411531531 is a deficient number, since it is larger than the sum of its proper divisors (11895295477).

21411531531 is a wasteful number, since it uses less digits than its factorization.

21411531531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183004562 (or 183004559 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The spelling of 21411531531 in words is "twenty-one billion, four hundred eleven million, five hundred thirty-one thousand, five hundred thirty-one".