21997067551200 has 1440 divisors, whose sum is σ = 93619693956096. Its totient is φ = 4921901936640.

The previous prime is 21997067551183. The next prime is 21997067551213. The reversal of 21997067551200 is 215576079912.

It is a happy number.

21997067551200 is a `hidden beast` number, since 2 + 1 + 9 + 9 + 7 + 0 + 67 + 551 + 20 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1440).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 15458233689 + ... + 15458235111.

Almost surely, 2^{21997067551200} is an apocalyptic number.

21997067551200 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 21997067551200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46809846978048).

21997067551200 is an abundant number, since it is smaller than the sum of its proper divisors (71622626404896).

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

21997067551200 is a wasteful number, since it uses less digits than its factorization.

21997067551200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158 (or 2136 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 54.

The spelling of 21997067551200 in words is "twenty-one trillion, nine hundred ninety-seven billion, sixty-seven million, five hundred fifty-one thousand, two hundred".