21054444450 has 96 divisors (see below), whose sum is σ = 56661498432. Its totient is φ = 5143008000.

The previous prime is 21054444419. The next prime is 21054444451. The reversal of 21054444450 is 5444445012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21054444451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 214240 + ... + 296660.

It is an arithmetic number, because the mean of its divisors is an integer number (590223942).

Almost surely, 2^21054444450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21054444450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28330749216).

21054444450 is an abundant number, since it is smaller than the sum of its proper divisors (35607053982).

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

21054444450 is a wasteful number, since it uses less digits than its factorization.

21054444450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82580 (or 82575 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 33.

Adding to 21054444450 its reverse (5444445012), we get a palindrome (26498889462).

The spelling of 21054444450 in words is "twenty-one billion, fifty-four million, four hundred forty-four thousand, four hundred fifty".