21773912832 has 432 divisors, whose sum is σ = 76377984480. Its totient is φ = 6098706432.

The previous prime is 21773912821. The next prime is 21773912843. The reversal of 21773912832 is 23821937712.

21773912832 is a `hidden beast` number, since 217 + 73 + 91 + 283 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21773912821) and next prime (21773912843).

It is a tau number, because it is divible by the number of its divisors (432).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17949858 + ... + 17951070.

It is an arithmetic number, because the mean of its divisors is an integer number (176800890).

Almost surely, 2^21773912832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21773912832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38188992240).

21773912832 is an abundant number, since it is smaller than the sum of its proper divisors (54604071648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21773912832 is a wasteful number, since it uses less digits than its factorization.

21773912832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305 (or 1278 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The spelling of 21773912832 in words is "twenty-one billion, seven hundred seventy-three million, nine hundred twelve thousand, eight hundred thirty-two".