21276372280800 has 864 divisors, whose sum is σ = 87442435325952. Its totient is φ = 4453693009920.

The previous prime is 21276372280799. The next prime is 21276372280837. The reversal of 21276372280800 is 808227367212.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21276372280800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 194102809 + ... + 194212391.

It is an arithmetic number, because the mean of its divisors is an integer number (101206522368).

Almost surely, 2^{21276372280800} is an apocalyptic number.

21276372280800 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 21276372280800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43721217662976).

21276372280800 is an abundant number, since it is smaller than the sum of its proper divisors (66166063045152).

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

21276372280800 is a wasteful number, since it uses less digits than its factorization.

21276372280800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109760 (or 109740 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

The spelling of 21276372280800 in words is "twenty-one trillion, two hundred seventy-six billion, three hundred seventy-two million, two hundred eighty thousand, eight hundred".