21190249382400 has 1920 divisors, whose sum is σ = 91109936924160. Its totient is φ = 4724065566720.

The previous prime is 21190249382381. The next prime is 21190249382461. The reversal of 21190249382400 is 428394209112.

21190249382400 is a `hidden beast` number, since 2 + 1 + 190 + 2 + 49 + 382 + 40 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1920).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 17130354582 + ... + 17130355818.

It is an arithmetic number, because the mean of its divisors is an integer number (47453092148).

Almost surely, 2^{21190249382400} is an apocalyptic number.

21190249382400 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 21190249382400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45554968462080).

21190249382400 is an abundant number, since it is smaller than the sum of its proper divisors (69919687541760).

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

21190249382400 is a wasteful number, since it uses less digits than its factorization.

21190249382400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451 (or 1424 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 21190249382400 in words is "twenty-one trillion, one hundred ninety billion, two hundred forty-nine million, three hundred eighty-two thousand, four hundred".