21722690571 has 8 divisors (see below), whose sum is σ = 28964276880. Its totient is φ = 14481448992.

The previous prime is 21722690569. The next prime is 21722690579. The reversal of 21722690571 is 17509622712.

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

It is not a de Polignac number, because 21722690571 - 2¹ = 21722690569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21722690579) 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 7 ways as a sum of consecutive naturals, for example, 167685 + ... + 267513.

It is an arithmetic number, because the mean of its divisors is an integer number (3620534610).

Almost surely, 2^21722690571 is an apocalyptic number.

21722690571 is a deficient number, since it is larger than the sum of its proper divisors (7241586309).

21722690571 is an equidigital number, since it uses as much as digits as its factorization.

21722690571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172365.

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 21722690571 in words is "twenty-one billion, seven hundred twenty-two million, six hundred ninety thousand, five hundred seventy-one".