21550345145 has 8 divisors (see below), whose sum is σ = 29554759104. Its totient is φ = 14777379504.

The previous prime is 21550345123. The next prime is 21550345153. The reversal of 21550345145 is 54154305512.

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 21550345145 - 2²⁸ = 21281909689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 615724147 = 21550345145 / (2 + 1 + 5 + 5 + 0 + 3 + 4 + 5 + 1 + 4 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307862039 + ... + 307862108.

It is an arithmetic number, because the mean of its divisors is an integer number (3694344888).

Almost surely, 2^21550345145 is an apocalyptic number.

It is an amenable number.

21550345145 is a deficient number, since it is larger than the sum of its proper divisors (8004413959).

21550345145 is an equidigital number, since it uses as much as digits as its factorization.

21550345145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615724159.

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 21550345145 in words is "twenty-one billion, five hundred fifty million, three hundred forty-five thousand, one hundred forty-five".