21441045553 has 4 divisors (see below), whose sum is σ = 21553302528. Its totient is φ = 21328788580.

The previous prime is 21441045551. The next prime is 21441045583. The reversal of 21441045553 is 35554014412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21441045553 - 2¹ = 21441045551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441045551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56128201 + ... + 56128582.

It is an arithmetic number, because the mean of its divisors is an integer number (5388325632).

Almost surely, 2^21441045553 is an apocalyptic number.

It is an amenable number.

21441045553 is a deficient number, since it is larger than the sum of its proper divisors (112256975).

21441045553 is a wasteful number, since it uses less digits than its factorization.

21441045553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112256974.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 21441045553 its reverse (35554014412), we get a palindrome (56995059965).

The spelling of 21441045553 in words is "twenty-one billion, four hundred forty-one million, forty-five thousand, five hundred fifty-three".