21711213807 has 8 divisors (see below), whose sum is σ = 29621501184. Its totient is φ = 14137534488.

The previous prime is 21711213803. The next prime is 21711213809. The reversal of 21711213807 is 70831211712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21711213807 - 2² = 21711213803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21711213803) 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, 84151863 + ... + 84152120.

It is an arithmetic number, because the mean of its divisors is an integer number (3702687648).

Almost surely, 2^21711213807 is an apocalyptic number.

21711213807 is a deficient number, since it is larger than the sum of its proper divisors (7910287377).

21711213807 is a wasteful number, since it uses less digits than its factorization.

21711213807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168304029.

The product of its (nonzero) digits is 4704, while the sum is 33.

The spelling of 21711213807 in words is "twenty-one billion, seven hundred eleven million, two hundred thirteen thousand, eight hundred seven".