21496773181 has 8 divisors (see below), whose sum is σ = 23715014904. Its totient is φ = 19359194880.

The previous prime is 21496773101. The next prime is 21496773253. The reversal of 21496773181 is 18137769412.

It can be written as a sum of positive squares in 4 ways, for example, as 2247708100 + 19249065081 = 47410^2 + 138741^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21496773181 is a prime.

It is a super-2 number, since 2×21496773181² (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 (21496773101) 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, 20165296 + ... + 20166361.

It is an arithmetic number, because the mean of its divisors is an integer number (2964376863).

Almost surely, 2^21496773181 is an apocalyptic number.

It is an amenable number.

21496773181 is a deficient number, since it is larger than the sum of its proper divisors (2218241723).

21496773181 is a wasteful number, since it uses less digits than its factorization.

21496773181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40331711.

The product of its digits is 508032, while the sum is 49.

The spelling of 21496773181 in words is "twenty-one billion, four hundred ninety-six million, seven hundred seventy-three thousand, one hundred eighty-one".