20424113021 has 16 divisors (see below), whose sum is σ = 23305713984. Its totient is φ = 17731317504.

The previous prime is 20424113009. The next prime is 20424113051. The reversal of 20424113021 is 12031142402.

It is a cyclic number.

It is not a de Polignac number, because 20424113021 - 2³⁰ = 19350371197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20424112984 and 20424113002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424113051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282986 + ... + 347748.

It is an arithmetic number, because the mean of its divisors is an integer number (1456607124).

Almost surely, 2^20424113021 is an apocalyptic number.

It is an amenable number.

20424113021 is a deficient number, since it is larger than the sum of its proper divisors (2881600963).

20424113021 is a wasteful number, since it uses less digits than its factorization.

20424113021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66220.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20424113021 its reverse (12031142402), we get a palindrome (32455255423).

The spelling of 20424113021 in words is "twenty billion, four hundred twenty-four million, one hundred thirteen thousand, twenty-one".