21144305235 has 16 divisors (see below), whose sum is σ = 33845298336. Its totient is φ = 11272159488.

The previous prime is 21144305167. The next prime is 21144305243. The reversal of 21144305235 is 53250344112.

It is not a de Polignac number, because 21144305235 - 2¹⁸ = 21144043091 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 263674 + ... + 334383.

It is an arithmetic number, because the mean of its divisors is an integer number (2115331146).

Almost surely, 2^21144305235 is an apocalyptic number.

21144305235 is a deficient number, since it is larger than the sum of its proper divisors (12700993101).

21144305235 is a wasteful number, since it uses less digits than its factorization.

21144305235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600422.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21144305235 its reverse (53250344112), we get a palindrome (74394649347).

The spelling of 21144305235 in words is "twenty-one billion, one hundred forty-four million, three hundred five thousand, two hundred thirty-five".