21723522085 has 8 divisors (see below), whose sum is σ = 26273488896. Its totient is φ = 17241976080.

The previous prime is 21723522083. The next prime is 21723522113. The reversal of 21723522085 is 58022532712.

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

It is not a de Polignac number, because 21723522085 - 2¹ = 21723522083 is a prime.

It is a super-2 number, since 2×21723522085² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21723522083) 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, 17104501 + ... + 17105770.

It is an arithmetic number, because the mean of its divisors is an integer number (3284186112).

Almost surely, 2^21723522085 is an apocalyptic number.

It is an amenable number.

21723522085 is a deficient number, since it is larger than the sum of its proper divisors (4549966811).

21723522085 is a wasteful number, since it uses less digits than its factorization.

21723522085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34210403.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 21723522085 in words is "twenty-one billion, seven hundred twenty-three million, five hundred twenty-two thousand, eighty-five".