21722727219 has 4 divisors (see below), whose sum is σ = 28963636296. Its totient is φ = 14481818144.

The previous prime is 21722727217. The next prime is 21722727241. The reversal of 21722727219 is 91272722712.

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 21722727219 - 2¹ = 21722727217 is a prime.

It is a super-3 number, since 3×21722727219³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21722727217) 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, 3620454534 + ... + 3620454539.

It is an arithmetic number, because the mean of its divisors is an integer number (7240909074).

Almost surely, 2^21722727219 is an apocalyptic number.

21722727219 is a deficient number, since it is larger than the sum of its proper divisors (7240909077).

21722727219 is an equidigital number, since it uses as much as digits as its factorization.

21722727219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7240909076.

The product of its digits is 98784, while the sum is 42.

The spelling of 21722727219 in words is "twenty-one billion, seven hundred twenty-two million, seven hundred twenty-seven thousand, two hundred nineteen".