21242033441 has 4 divisors (see below), whose sum is σ = 21242369412. Its totient is φ = 21241697472.

The previous prime is 21242033381. The next prime is 21242033489. The reversal of 21242033441 is 14433024212.

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 16306268416 + 4935765025 = 127696^2 + 70255^2 .

It is a cyclic number.

It is not a de Polignac number, because 21242033441 - 2²² = 21237839137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21242033441.

It is not an unprimeable number, because it can be changed into a prime (21242033741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41300 + ... + 210213.

It is an arithmetic number, because the mean of its divisors is an integer number (5310592353).

Almost surely, 2^21242033441 is an apocalyptic number.

It is an amenable number.

21242033441 is a deficient number, since it is larger than the sum of its proper divisors (335971).

21242033441 is an equidigital number, since it uses as much as digits as its factorization.

21242033441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335970.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21242033441 its reverse (14433024212), we get a palindrome (35675057653).

The spelling of 21242033441 in words is "twenty-one billion, two hundred forty-two million, thirty-three thousand, four hundred forty-one".