21775004454 has 128 divisors (see below), whose sum is σ = 54020736000. Its totient is φ = 5832207360.

The previous prime is 21775004453. The next prime is 21775004483. The reversal of 21775004454 is 45440057712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21775004453) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3790024 + ... + 3795764.

It is an arithmetic number, because the mean of its divisors is an integer number (422037000).

Almost surely, 2^21775004454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21775004454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27010368000).

21775004454 is an abundant number, since it is smaller than the sum of its proper divisors (32245731546).

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

21775004454 is a wasteful number, since it uses less digits than its factorization.

21775004454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5883 (or 5869 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 39.

The spelling of 21775004454 in words is "twenty-one billion, seven hundred seventy-five million, four thousand, four hundred fifty-four".