20121244441 has 4 divisors (see below), whose sum is σ = 20256286500. Its totient is φ = 19986202384.

The previous prime is 20121244433. The next prime is 20121244459. The reversal of 20121244441 is 14444212102.

It is a happy number.

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 5577849225 + 14543395216 = 74685^2 + 120596^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121244441 - 2³ = 20121244433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121244541) 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, 67520806 + ... + 67521103.

It is an arithmetic number, because the mean of its divisors is an integer number (5064071625).

Almost surely, 2^20121244441 is an apocalyptic number.

It is an amenable number.

20121244441 is a deficient number, since it is larger than the sum of its proper divisors (135042059).

20121244441 is a wasteful number, since it uses less digits than its factorization.

20121244441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135042058.

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

Adding to 20121244441 its reverse (14444212102), we get a palindrome (34565456543).

The spelling of 20121244441 in words is "twenty billion, one hundred twenty-one million, two hundred forty-four thousand, four hundred forty-one".