21014144455 has 8 divisors (see below), whose sum is σ = 25217786592. Its totient is φ = 16810773408.

The previous prime is 21014144453. The next prime is 21014144507. The reversal of 21014144455 is 55444141012.

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

It is a cyclic number.

It is not a de Polignac number, because 21014144455 - 2¹ = 21014144453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014144453) 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 7 ways as a sum of consecutive naturals, for example, 196357 + ... + 283873.

It is an arithmetic number, because the mean of its divisors is an integer number (3152223324).

Almost surely, 2^21014144455 is an apocalyptic number.

21014144455 is a deficient number, since it is larger than the sum of its proper divisors (4203642137).

21014144455 is an equidigital number, since it uses as much as digits as its factorization.

21014144455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135545.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 21014144455 its reverse (55444141012), we get a palindrome (76458285467).

The spelling of 21014144455 in words is "twenty-one billion, fourteen million, one hundred forty-four thousand, four hundred fifty-five".