23187821305 has 32 divisors (see below), whose sum is σ = 31446455040. Its totient is φ = 16259147520.

The previous prime is 23187821299. The next prime is 23187821329. The reversal of 23187821305 is 50312878132.

It is a happy number.

It is not a de Polignac number, because 23187821305 - 2¹³ = 23187813113 is a prime.

It is a super-2 number, since 2×23187821305² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1149567 + ... + 1169563.

It is an arithmetic number, because the mean of its divisors is an integer number (982701720).

Almost surely, 2^23187821305 is an apocalyptic number.

It is an amenable number.

23187821305 is a deficient number, since it is larger than the sum of its proper divisors (8258633735).

23187821305 is a wasteful number, since it uses less digits than its factorization.

23187821305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20769.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 23187821305 in words is "twenty-three billion, one hundred eighty-seven million, eight hundred twenty-one thousand, three hundred five".