21800270135 has 8 divisors (see below), whose sum is σ = 29897513376. Its totient is φ = 14948756640.

The previous prime is 21800270123. The next prime is 21800270197. The reversal of 21800270135 is 53107200812.

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

It is not a de Polignac number, because 21800270135 - 2¹⁴ = 21800253751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21800270098 and 21800270107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311432396 + ... + 311432465.

It is an arithmetic number, because the mean of its divisors is an integer number (3737189172).

Almost surely, 2^21800270135 is an apocalyptic number.

21800270135 is a deficient number, since it is larger than the sum of its proper divisors (8097243241).

21800270135 is an equidigital number, since it uses as much as digits as its factorization.

21800270135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622864873.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 21800270135 its reverse (53107200812), we get a palindrome (74907470947).

The spelling of 21800270135 in words is "twenty-one billion, eight hundred million, two hundred seventy thousand, one hundred thirty-five".