21169621200 has 240 divisors, whose sum is σ = 83463019136. Its totient is φ = 4466534400.

The previous prime is 21169621181. The next prime is 21169621211. The reversal of 21169621200 is 212696112.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12270 + ... + 206130.

Almost surely, 2^21169621200 is an apocalyptic number.

21169621200 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 21169621200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41731509568).

21169621200 is an abundant number, since it is smaller than the sum of its proper divisors (62293397936).

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

21169621200 is a wasteful number, since it uses less digits than its factorization.

21169621200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193902 (or 193891 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 21169621200 in words is "twenty-one billion, one hundred sixty-nine million, six hundred twenty-one thousand, two hundred".