21435545044 has 6 divisors (see below), whose sum is σ = 37512203834. Its totient is φ = 10717772520.

The previous prime is 21435545041. The next prime is 21435545051. The reversal of 21435545044 is 44054553412.

It can be written as a sum of positive squares in only one way, i.e., 19035720900 + 2399824144 = 137970^2 + 48988^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21435544994 and 21435545012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435545041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2679443127 + ... + 2679443134.

Almost surely, 2^21435545044 is an apocalyptic number.

It is an amenable number.

21435545044 is a deficient number, since it is larger than the sum of its proper divisors (16076658790).

21435545044 is a wasteful number, since it uses less digits than its factorization.

21435545044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358886265 (or 5358886263 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 37.

The spelling of 21435545044 in words is "twenty-one billion, four hundred thirty-five million, five hundred forty-five thousand, forty-four".