21711747331 has 4 divisors (see below), whose sum is σ = 21712139464. Its totient is φ = 21711355200.

The previous prime is 21711747293. The next prime is 21711747349. The reversal of 21711747331 is 13374711712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21711747331 - 2²³ = 21703358723 is a prime.

It is a super-2 number, since 2×21711747331² (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 (21711747731) 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 3 ways as a sum of consecutive naturals, for example, 95985 + ... + 229426.

It is an arithmetic number, because the mean of its divisors is an integer number (5428034866).

Almost surely, 2^21711747331 is an apocalyptic number.

21711747331 is a deficient number, since it is larger than the sum of its proper divisors (392133).

21711747331 is an equidigital number, since it uses as much as digits as its factorization.

21711747331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392132.

The product of its digits is 24696, while the sum is 37.

The spelling of 21711747331 in words is "twenty-one billion, seven hundred eleven million, seven hundred forty-seven thousand, three hundred thirty-one".