21412444553 has 8 divisors (see below), whose sum is σ = 22198250880. Its totient is φ = 20629801360.

The previous prime is 21412444523. The next prime is 21412444579. The reversal of 21412444553 is 35544421412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21412444553 - 2⁶ = 21412444489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21412444523) 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, 776993 + ... + 804078.

It is an arithmetic number, because the mean of its divisors is an integer number (2774781360).

Almost surely, 2^21412444553 is an apocalyptic number.

It is an amenable number.

21412444553 is a deficient number, since it is larger than the sum of its proper divisors (785806327).

21412444553 is a wasteful number, since it uses less digits than its factorization.

21412444553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581567.

The product of its digits is 76800, while the sum is 35.

Adding to 21412444553 its reverse (35544421412), we get a palindrome (56956865965).

The spelling of 21412444553 in words is "twenty-one billion, four hundred twelve million, four hundred forty-four thousand, five hundred fifty-three".