21444541151455 has 4 divisors (see below), whose sum is σ = 25733449381752. Its totient is φ = 17155632921160.

The previous prime is 21444541151389. The next prime is 21444541151479. The reversal of 21444541151455 is 55415114544412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21444541151455 - 2²¹ = 21444539054303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144454115141 + ... + 2144454115150.

It is an arithmetic number, because the mean of its divisors is an integer number (6433362345438).

Almost surely, 2^{21444541151455} is an apocalyptic number.

21444541151455 is a deficient number, since it is larger than the sum of its proper divisors (4288908230297).

21444541151455 is an equidigital number, since it uses as much as digits as its factorization.

21444541151455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4288908230296.

The product of its digits is 1280000, while the sum is 46.

Adding to 21444541151455 its reverse (55415114544412), we get a palindrome (76859655695867).

The spelling of 21444541151455 in words is "twenty-one trillion, four hundred forty-four billion, five hundred forty-one million, one hundred fifty-one thousand, four hundred fifty-five".