21424668144450 has 96 divisors (see below), whose sum is σ = 54087313636800. Its totient is φ = 5610841528320.

The previous prime is 21424668144413. The next prime is 21424668144479. The reversal of 21424668144450 is 5444186642412.

It is a junction number, because it is equal to n+sod(n) for n = 21424668144393 and 21424668144402.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7730014 + ... + 10129286.

It is an arithmetic number, because the mean of its divisors is an integer number (563409517050).

Almost surely, 2^{21424668144450} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21424668144450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27043656818400).

21424668144450 is an abundant number, since it is smaller than the sum of its proper divisors (32662645492350).

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

21424668144450 is a wasteful number, since it uses less digits than its factorization.

21424668144450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400356 (or 2400351 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 51.

The spelling of 21424668144450 in words is "twenty-one trillion, four hundred twenty-four billion, six hundred sixty-eight million, one hundred forty-four thousand, four hundred fifty".