21450213422144 has 112 divisors (see below), whose sum is σ = 47183114858880. Its totient is φ = 9669860928000.

The previous prime is 21450213422119. The next prime is 21450213422147. The reversal of 21450213422144 is 44122431205412.

It is a super-2 number, since 2×21450213422144² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21450213422147) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4272269 + ... + 7820019.

It is an arithmetic number, because the mean of its divisors is an integer number (421277811240).

Almost surely, 2^{21450213422144} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21450213422144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23591557429440).

21450213422144 is an abundant number, since it is smaller than the sum of its proper divisors (25732901436736).

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

21450213422144 is an equidigital number, since it uses as much as digits as its factorization.

21450213422144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547845 (or 3547809 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 35.

Adding to 21450213422144 its reverse (44122431205412), we get a palindrome (65572644627556).

The spelling of 21450213422144 in words is "twenty-one trillion, four hundred fifty billion, two hundred thirteen million, four hundred twenty-two thousand, one hundred forty-four".