21154168867200 has 192 divisors, whose sum is σ = 73343730849600. Its totient is φ = 5344211036160.

The previous prime is 21154168867187. The next prime is 21154168867229. The reversal of 21154168867200 is 276886145112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57806002 + ... + 58170801.

It is an arithmetic number, because the mean of its divisors is an integer number (381998598175).

Almost surely, 2^{21154168867200} is an apocalyptic number.

21154168867200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21154168867200 is an abundant number, since it is smaller than the sum of its proper divisors (52189561982400).

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

21154168867200 is a wasteful number, since it uses less digits than its factorization.

21154168867200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115976849 (or 115976832 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 51.

The spelling of 21154168867200 in words is "twenty-one trillion, one hundred fifty-four billion, one hundred sixty-eight million, eight hundred sixty-seven thousand, two hundred".