21444871020455 has 8 divisors (see below), whose sum is σ = 25744572144000. Its totient is φ = 17148745536736.

The previous prime is 21444871020437. The next prime is 21444871020473. The reversal of 21444871020455 is 55402017844412.

It is an interprime number because it is at equal distance from previous prime (21444871020437) and next prime (21444871020473).

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-21444871020455 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 893896760 + ... + 893920749.

It is an arithmetic number, because the mean of its divisors is an integer number (3218071518000).

Almost surely, 2^{21444871020455} is an apocalyptic number.

21444871020455 is a deficient number, since it is larger than the sum of its proper divisors (4299701123545).

21444871020455 is a wasteful number, since it uses less digits than its factorization.

21444871020455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787819913.

The product of its (nonzero) digits is 1433600, while the sum is 47.

Adding to 21444871020455 its reverse (55402017844412), we get a palindrome (76846888864867).

The spelling of 21444871020455 in words is "twenty-one trillion, four hundred forty-four billion, eight hundred seventy-one million, twenty thousand, four hundred fifty-five".