21773290399 has 8 divisors (see below), whose sum is σ = 25065394848. Its totient is φ = 18526594560.

The previous prime is 21773290391. The next prime is 21773290411. The reversal of 21773290399 is 99309237712.

It is a happy number.

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 21773290399 - 2³ = 21773290391 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 (21773290391) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11351122 + ... + 11353039.

It is an arithmetic number, because the mean of its divisors is an integer number (3133174356).

Almost surely, 2^21773290399 is an apocalyptic number.

21773290399 is a deficient number, since it is larger than the sum of its proper divisors (3292104449).

21773290399 is a wasteful number, since it uses less digits than its factorization.

21773290399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22704305.

The product of its (nonzero) digits is 1285956, while the sum is 52.

The spelling of 21773290399 in words is "twenty-one billion, seven hundred seventy-three million, two hundred ninety thousand, three hundred ninety-nine".