21234202441 has 4 divisors (see below), whose sum is σ = 21244369300. Its totient is φ = 21224035584.

The previous prime is 21234202417. The next prime is 21234202453. The reversal of 21234202441 is 14420243212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16946572041 + 4287630400 = 130179^2 + 65480^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234202441 - 2¹⁹ = 21233678153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234202481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5080296 + ... + 5084473.

It is an arithmetic number, because the mean of its divisors is an integer number (5311092325).

Almost surely, 2^21234202441 is an apocalyptic number.

It is an amenable number.

21234202441 is a deficient number, since it is larger than the sum of its proper divisors (10166859).

21234202441 is a wasteful number, since it uses less digits than its factorization.

21234202441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10166858.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21234202441 its reverse (14420243212), we get a palindrome (35654445653).

The spelling of 21234202441 in words is "twenty-one billion, two hundred thirty-four million, two hundred two thousand, four hundred forty-one".