21155141364305 has 8 divisors (see below), whose sum is σ = 27338951917032. Its totient is φ = 15622258238208.

The previous prime is 21155141364277. The next prime is 21155141364307. The reversal of 21155141364305 is 50346314155112.

It can be written as a sum of positive squares in 4 ways, for example, as 2285648090896 + 18869493273409 = 1511836^2 + 4343903^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21155141364305 - 2²² = 21155137170001 is a prime.

It is a super-2 number, since 2×21155141364305² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21155141364307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162731856584 + ... + 162731856713.

It is an arithmetic number, because the mean of its divisors is an integer number (3417368989629).

Almost surely, 2^{21155141364305} is an apocalyptic number.

It is an amenable number.

21155141364305 is a deficient number, since it is larger than the sum of its proper divisors (6183810552727).

21155141364305 is a wasteful number, since it uses less digits than its factorization.

21155141364305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325463713315.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 21155141364305 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-one million, three hundred sixty-four thousand, three hundred five".