20621211241 has 4 divisors (see below), whose sum is σ = 20622599812. Its totient is φ = 20619822672.

The previous prime is 20621211227. The next prime is 20621211257. The reversal of 20621211241 is 14211212602.

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 17166240400 + 3454970841 = 131020^2 + 58779^2 .

It is a cyclic number.

It is not a de Polignac number, because 20621211241 - 2⁵ = 20621211209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20621211041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671766 + ... + 701791.

It is an arithmetic number, because the mean of its divisors is an integer number (5155649953).

Almost surely, 2^20621211241 is an apocalyptic number.

It is an amenable number.

20621211241 is a deficient number, since it is larger than the sum of its proper divisors (1388571).

20621211241 is a wasteful number, since it uses less digits than its factorization.

20621211241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388570.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 20621211241 its reverse (14211212602), we get a palindrome (34832423843).

The spelling of 20621211241 in words is "twenty billion, six hundred twenty-one million, two hundred eleven thousand, two hundred forty-one".