21073773600 has 216 divisors, whose sum is σ = 81067280112. Its totient is φ = 5108774400.

The previous prime is 21073773593. The next prime is 21073773629. The reversal of 21073773600 is 637737012.

21073773600 is a `hidden beast` number, since 2 + 10 + 7 + 37 + 7 + 3 + 600 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 53842 + ... + 212241.

It is an arithmetic number, because the mean of its divisors is an integer number (375311482).

Almost surely, 2^21073773600 is an apocalyptic number.

21073773600 is a gapful number since it is divisible by the number (20) 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 21073773600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40533640056).

21073773600 is an abundant number, since it is smaller than the sum of its proper divisors (59993506512).

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

21073773600 is a wasteful number, since it uses less digits than its factorization.

21073773600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266120 (or 266104 counting only the distinct ones).

The product of its (nonzero) digits is 37044, while the sum is 36.

The spelling of 21073773600 in words is "twenty-one billion, seventy-three million, seven hundred seventy-three thousand, six hundred".