21444111254 has 16 divisors (see below), whose sum is σ = 32703750000. Its totient is φ = 10543425024.

The previous prime is 21444111239. The next prime is 21444111259. The reversal of 21444111254 is 45211144412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444111259) 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, 64379 + ... + 216870.

It is an arithmetic number, because the mean of its divisors is an integer number (2043984375).

Almost surely, 2^21444111254 is an apocalyptic number.

21444111254 is a deficient number, since it is larger than the sum of its proper divisors (11259638746).

21444111254 is a wasteful number, since it uses less digits than its factorization.

21444111254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281887.

The product of its digits is 5120, while the sum is 29.

Adding to 21444111254 its reverse (45211144412), we get a palindrome (66655255666).

The spelling of 21444111254 in words is "twenty-one billion, four hundred forty-four million, one hundred eleven thousand, two hundred fifty-four".