21711430747 has 4 divisors (see below), whose sum is σ = 21712332280. Its totient is φ = 21710529216.

The previous prime is 21711430693. The next prime is 21711430781. The reversal of 21711430747 is 74703411712.

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 21711430747 - 2¹¹ = 21711428699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21711431747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413622 + ... + 463147.

It is an arithmetic number, because the mean of its divisors is an integer number (5428083070).

Almost surely, 2^21711430747 is an apocalyptic number.

21711430747 is a deficient number, since it is larger than the sum of its proper divisors (901533).

21711430747 is an equidigital number, since it uses as much as digits as its factorization.

21711430747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901532.

The product of its (nonzero) digits is 32928, while the sum is 37.

The spelling of 21711430747 in words is "twenty-one billion, seven hundred eleven million, four hundred thirty thousand, seven hundred forty-seven".