21155206034363 has 8 divisors (see below), whose sum is σ = 21168040824000. Its totient is φ = 21142371971968.

The previous prime is 21155206034359. The next prime is 21155206034371. The reversal of 21155206034363 is 36343060255112.

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 21155206034363 - 2² = 21155206034359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21155206034363.

It is not an unprimeable number, because it can be changed into a prime (21155206034323) 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, 65083598 + ... + 65407836.

It is an arithmetic number, because the mean of its divisors is an integer number (2646005103000).

Almost surely, 2^{21155206034363} is an apocalyptic number.

21155206034363 is a deficient number, since it is larger than the sum of its proper divisors (12834789637).

21155206034363 is a wasteful number, since it uses less digits than its factorization.

21155206034363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363621.

The product of its (nonzero) digits is 388800, while the sum is 41.

Adding to 21155206034363 its reverse (36343060255112), we get a palindrome (57498266289475).

The spelling of 21155206034363 in words is "twenty-one trillion, one hundred fifty-five billion, two hundred six million, thirty-four thousand, three hundred sixty-three".