21214420441 has 8 divisors (see below), whose sum is σ = 21678471360. Its totient is φ = 20755332912.

The previous prime is 21214420421. The next prime is 21214420457. The reversal of 21214420441 is 14402441212.

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 21214420441 - 2²⁷ = 21080202713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214420421) 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, 1232206 + ... + 1249303.

It is an arithmetic number, because the mean of its divisors is an integer number (2709808920).

Almost surely, 2^21214420441 is an apocalyptic number.

It is an amenable number.

21214420441 is a deficient number, since it is larger than the sum of its proper divisors (464050919).

21214420441 is a wasteful number, since it uses less digits than its factorization.

21214420441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481695.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21214420441 its reverse (14402441212), we get a palindrome (35616861653).

The spelling of 21214420441 in words is "twenty-one billion, two hundred fourteen million, four hundred twenty thousand, four hundred forty-one".