21455550414044 has 24 divisors (see below), whose sum is σ = 40113283580160. Its totient is φ = 10011466569456.

The previous prime is 21455550414031. The next prime is 21455550414047. The reversal of 21455550414044 is 44041405555412.

It is a junction number, because it is equal to n+sod(n) for n = 21455550413986 and 21455550414004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455550414047) 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, 2106785012 + ... + 2106795195.

It is an arithmetic number, because the mean of its divisors is an integer number (1671386815840).

Almost surely, 2^{21455550414044} is an apocalyptic number.

It is an amenable number.

21455550414044 is a deficient number, since it is larger than the sum of its proper divisors (18657733166116).

21455550414044 is a wasteful number, since it uses less digits than its factorization.

21455550414044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213580297 (or 4213580295 counting only the distinct ones).

The product of its (nonzero) digits is 1280000, while the sum is 44.

Adding to 21455550414044 its reverse (44041405555412), we get a palindrome (65496955969456).

The spelling of 21455550414044 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred fifty million, four hundred fourteen thousand, forty-four".