21444250421351 has 8 divisors (see below), whose sum is σ = 21738368376384. Its totient is φ = 21150142225920.

The previous prime is 21444250421329. The next prime is 21444250421369. The reversal of 21444250421351 is 15312405244412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21444250421351 is a prime.

It is a super-2 number, since 2×21444250421351² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444253421351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2040770 + ... + 6859536.

It is an arithmetic number, because the mean of its divisors is an integer number (2717296047048).

Almost surely, 2^{21444250421351} is an apocalyptic number.

21444250421351 is a deficient number, since it is larger than the sum of its proper divisors (294117955033).

21444250421351 is an equidigital number, since it uses as much as digits as its factorization.

21444250421351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4879801.

The product of its (nonzero) digits is 153600, while the sum is 38.

Adding to 21444250421351 its reverse (15312405244412), we get a palindrome (36756655665763).

The spelling of 21444250421351 in words is "twenty-one trillion, four hundred forty-four billion, two hundred fifty million, four hundred twenty-one thousand, three hundred fifty-one".