21323278229 has 16 divisors (see below), whose sum is σ = 23914500480. Its totient is φ = 18841901760.

The previous prime is 21323278217. The next prime is 21323278231. The reversal of 21323278229 is 92287232312.

It is not a de Polignac number, because 21323278229 - 2²⁰ = 21322229653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323277229) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 386432 + ... + 438150.

It is an arithmetic number, because the mean of its divisors is an integer number (1494656280).

Almost surely, 2^21323278229 is an apocalyptic number.

It is an amenable number.

21323278229 is a deficient number, since it is larger than the sum of its proper divisors (2591222251).

21323278229 is a wasteful number, since it uses less digits than its factorization.

21323278229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52780.

The product of its digits is 145152, while the sum is 41.

The spelling of 21323278229 in words is "twenty-one billion, three hundred twenty-three million, two hundred seventy-eight thousand, two hundred twenty-nine".