21356254255145 has 8 divisors (see below), whose sum is σ = 25662183737280. Its totient is φ = 17061884316720.

The previous prime is 21356254255139. The next prime is 21356254255183. The reversal of 21356254255145 is 54155245265312.

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

It is not a de Polignac number, because 21356254255145 - 2⁸ = 21356254254889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21356254255093 and 21356254255102.

It is an unprimeable number.

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, 2889881861 + ... + 2889889250.

It is an arithmetic number, because the mean of its divisors is an integer number (3207772967160).

Almost surely, 2^{21356254255145} is an apocalyptic number.

It is an amenable number.

21356254255145 is a deficient number, since it is larger than the sum of its proper divisors (4305929482135).

21356254255145 is an equidigital number, since it uses as much as digits as its factorization.

21356254255145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5779771855.

The product of its digits is 7200000, while the sum is 50.

The spelling of 21356254255145 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred fifty-four million, two hundred fifty-five thousand, one hundred forty-five".