21897231179200 has 672 divisors, whose sum is σ = 60322790094336. Its totient is φ = 7771832893440.

The previous prime is 21897231179183. The next prime is 21897231179233. The reversal of 21897231179200 is 297113279812.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 29471374029 + ... + 29471374771.

It is an arithmetic number, because the mean of its divisors is an integer number (89766056688).

Almost surely, 2^{21897231179200} is an apocalyptic number.

21897231179200 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 21897231179200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30161395047168).

21897231179200 is an abundant number, since it is smaller than the sum of its proper divisors (38425558915136).

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

21897231179200 is a wasteful number, since it uses less digits than its factorization.

21897231179200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301 (or 1286 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 21897231179200 in words is "twenty-one trillion, eight hundred ninety-seven billion, two hundred thirty-one million, one hundred seventy-nine thousand, two hundred".