21533247711 has 8 divisors (see below), whose sum is σ = 31901107760. Its totient is φ = 14355498456.

The previous prime is 21533247587. The next prime is 21533247739. The reversal of 21533247711 is 11774233512.

21533247711 is a `hidden beast` number, since 2 + 153 + 32 + 477 + 1 + 1 = 666.

It is not a de Polignac number, because 21533247711 - 2¹¹ = 21533245663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533242711) 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 7 ways as a sum of consecutive naturals, for example, 398763820 + ... + 398763873.

It is an arithmetic number, because the mean of its divisors is an integer number (3987638470).

Almost surely, 2^21533247711 is an apocalyptic number.

21533247711 is a deficient number, since it is larger than the sum of its proper divisors (10367860049).

21533247711 is an equidigital number, since it uses as much as digits as its factorization.

21533247711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797527702 (or 797527696 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The spelling of 21533247711 in words is "twenty-one billion, five hundred thirty-three million, two hundred forty-seven thousand, seven hundred eleven".