21544314421 has 8 divisors (see below), whose sum is σ = 26070431040. Its totient is φ = 17380287168.

The previous prime is 21544314419. The next prime is 21544314427. The reversal of 21544314421 is 12441344512.

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 21544314421 - 2¹ = 21544314419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544314427) 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, 90522211 + ... + 90522448.

It is an arithmetic number, because the mean of its divisors is an integer number (3258803880).

Almost surely, 2^21544314421 is an apocalyptic number.

It is an amenable number.

21544314421 is a deficient number, since it is larger than the sum of its proper divisors (4526116619).

21544314421 is a wasteful number, since it uses less digits than its factorization.

21544314421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181044683.

The product of its digits is 15360, while the sum is 31.

Adding to 21544314421 its reverse (12441344512), we get a palindrome (33985658933).

The spelling of 21544314421 in words is "twenty-one billion, five hundred forty-four million, three hundred fourteen thousand, four hundred twenty-one".