21500003054444 has 6 divisors (see below), whose sum is σ = 37625005345284. Its totient is φ = 10750001527220.

The previous prime is 21500003054423. The next prime is 21500003054449. The reversal of 21500003054444 is 44445030000512.

It is a super-2 number, since 2×21500003054444² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21500003054444.

It is not an unprimeable number, because it can be changed into a prime (21500003054449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2687500381802 + ... + 2687500381809.

It is an arithmetic number, because the mean of its divisors is an integer number (6270834224214).

Almost surely, 2^{21500003054444} is an apocalyptic number.

It is an amenable number.

21500003054444 is a deficient number, since it is larger than the sum of its proper divisors (16125002290840).

21500003054444 is a wasteful number, since it uses less digits than its factorization.

21500003054444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375000763615 (or 5375000763613 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 21500003054444 its reverse (44445030000512), we get a palindrome (65945033054956).

The spelling of 21500003054444 in words is "twenty-one trillion, five hundred billion, three million, fifty-four thousand, four hundred forty-four".