20621124243 has 12 divisors (see below), whose sum is σ = 29985976800. Its totient is φ = 13655150736.

The previous prime is 20621124217. The next prime is 20621124299. The reversal of 20621124243 is 34242112602.

20621124243 is a `hidden beast` number, since 2 + 0 + 621 + 12 + 4 + 24 + 3 = 666.

It is not a de Polignac number, because 20621124243 - 2⁸ = 20621123987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20621124443) 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 11 ways as a sum of consecutive naturals, for example, 7687371 + ... + 7690052.

It is an arithmetic number, because the mean of its divisors is an integer number (2498831400).

Almost surely, 2^20621124243 is an apocalyptic number.

20621124243 is a deficient number, since it is larger than the sum of its proper divisors (9364852557).

20621124243 is a wasteful number, since it uses less digits than its factorization.

20621124243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15377578 (or 15377575 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 20621124243 its reverse (34242112602), we get a palindrome (54863236845).

The spelling of 20621124243 in words is "twenty billion, six hundred twenty-one million, one hundred twenty-four thousand, two hundred forty-three".