21496736181 has 16 divisors (see below), whose sum is σ = 30368822400.
Its totient is φ = 13479042048.
The previous prime is 21496736179. The next prime is 21496736197. The reversal of 21496736181 is 18163769412.
It is not a de Polignac number, because 21496736181 - 21 = 21496736179 is a prime.
It is a super-2 number, since 2×214967361812 (a number of 21 digits) contains 22 as substring.
It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 21496736181.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21496736381) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65601 + ... + 217478.
It is an arithmetic number, because the mean of its divisors is an integer number (1898051400).
Almost surely, 221496736181 is an apocalyptic number.
It is an amenable number.
21496736181 is a deficient number, since it is larger than the sum of its proper divisors (8872086219).
21496736181 is a wasteful number, since it uses less digits than its factorization.
21496736181 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 284588.
The product of its digits is 435456, while the sum is 48.
The spelling of 21496736181 in words is "twenty-one billion, four hundred ninety-six million, seven hundred thirty-six thousand, one hundred eighty-one".