20421322441 has 4 divisors (see below), whose sum is σ = 21992193412. Its totient is φ = 18850451472.

The previous prime is 20421322433. The next prime is 20421322459. The reversal of 20421322441 is 14422312402.

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 2134440000 + 18286882441 = 46200^2 + 135229^2 .

It is a cyclic number.

It is not a de Polignac number, because 20421322441 - 2³ = 20421322433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421322741) 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, 785435466 + ... + 785435491.

It is an arithmetic number, because the mean of its divisors is an integer number (5498048353).

Almost surely, 2^20421322441 is an apocalyptic number.

It is an amenable number.

20421322441 is a deficient number, since it is larger than the sum of its proper divisors (1570870971).

20421322441 is a wasteful number, since it uses less digits than its factorization.

20421322441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570870970.

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

Adding to 20421322441 its reverse (14422312402), we get a palindrome (34843634843).

The spelling of 20421322441 in words is "twenty billion, four hundred twenty-one million, three hundred twenty-two thousand, four hundred forty-one".