21044144154 has 32 divisors (see below), whose sum is σ = 46115029440. Its totient is φ = 6349161600.

The previous prime is 21044144071. The next prime is 21044144159. The reversal of 21044144154 is 45144144012.

It is not an unprimeable number, because it can be changed into a prime (21044144159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681067 + ... + 711294.

It is an arithmetic number, because the mean of its divisors is an integer number (1441094670).

Almost surely, 2^21044144154 is an apocalyptic number.

21044144154 is an abundant number, since it is smaller than the sum of its proper divisors (25070885286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21044144154 is a wasteful number, since it uses less digits than its factorization.

21044144154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392606.

The product of its (nonzero) digits is 10240, while the sum is 30.

Adding to 21044144154 its reverse (45144144012), we get a palindrome (66188288166).

The spelling of 21044144154 in words is "twenty-one billion, forty-four million, one hundred forty-four thousand, one hundred fifty-four".