21210343441 has 8 divisors (see below), whose sum is σ = 24756145920. Its totient is φ = 17793479328.

The previous prime is 21210343439. The next prime is 21210343477. The reversal of 21210343441 is 14434301212.

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 21210343441 - 2¹ = 21210343439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210343411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32234236 + ... + 32234893.

It is an arithmetic number, because the mean of its divisors is an integer number (3094518240).

Almost surely, 2^21210343441 is an apocalyptic number.

It is an amenable number.

21210343441 is a deficient number, since it is larger than the sum of its proper divisors (3545802479).

21210343441 is an equidigital number, since it uses as much as digits as its factorization.

21210343441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64469183.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21210343441 its reverse (14434301212), we get a palindrome (35644644653).

The spelling of 21210343441 in words is "twenty-one billion, two hundred ten million, three hundred forty-three thousand, four hundred forty-one".