21319817611 has 8 divisors (see below), whose sum is σ = 21911928320. Its totient is φ = 20735763048.

The previous prime is 21319817609. The next prime is 21319817641. The reversal of 21319817611 is 11671891312.

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

It is a cyclic number.

It is not a de Polignac number, because 21319817611 - 2¹ = 21319817609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21319817641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2008671 + ... + 2019256.

It is an arithmetic number, because the mean of its divisors is an integer number (2738991040).

Almost surely, 2^21319817611 is an apocalyptic number.

21319817611 is a deficient number, since it is larger than the sum of its proper divisors (592110709).

21319817611 is an equidigital number, since it uses as much as digits as its factorization.

21319817611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028073.

The product of its digits is 18144, while the sum is 40.

The spelling of 21319817611 in words is "twenty-one billion, three hundred nineteen million, eight hundred seventeen thousand, six hundred eleven".