21773974068 has 768 divisors, whose sum is σ = 79427174400. Its totient is φ = 4985487360.

The previous prime is 21773974067. The next prime is 21773974073. The reversal of 21773974068 is 86047937712.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21773974067) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 192689980 + ... + 192690092.

It is an arithmetic number, because the mean of its divisors is an integer number (103420800).

Almost surely, 2^21773974068 is an apocalyptic number.

21773974068 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21773974068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39713587200).

21773974068 is an abundant number, since it is smaller than the sum of its proper divisors (57653200332).

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

21773974068 is a wasteful number, since it uses less digits than its factorization.

21773974068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The spelling of 21773974068 in words is "twenty-one billion, seven hundred seventy-three million, nine hundred seventy-four thousand, sixty-eight".