21449539108400 has 960 divisors, whose sum is σ = 61222631500800. Its totient is φ = 7157735424000.

The previous prime is 21449539108357. The next prime is 21449539108433. The reversal of 21449539108400 is 480193594412.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 46528284170 + ... + 46528284630.

It is an arithmetic number, because the mean of its divisors is an integer number (63773574480).

Almost surely, 2^{21449539108400} is an apocalyptic number.

21449539108400 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 21449539108400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30611315750400).

21449539108400 is an abundant number, since it is smaller than the sum of its proper divisors (39773092392400).

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

21449539108400 is a wasteful number, since it uses less digits than its factorization.

21449539108400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858 (or 847 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 21449539108400 in words is "twenty-one trillion, four hundred forty-nine billion, five hundred thirty-nine million, one hundred eight thousand, four hundred".