20424220421 has 8 divisors (see below), whose sum is σ = 22485381600. Its totient is φ = 18397128240.

The previous prime is 20424220387. The next prime is 20424220459. The reversal of 20424220421 is 12402242402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20424220421 - 2²² = 20420026117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424220471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8515991 + ... + 8518388.

It is an arithmetic number, because the mean of its divisors is an integer number (2810672700).

Almost surely, 2^20424220421 is an apocalyptic number.

It is an amenable number.

20424220421 is a deficient number, since it is larger than the sum of its proper divisors (2061161179).

20424220421 is a wasteful number, since it uses less digits than its factorization.

20424220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17034499.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 20424220421 its reverse (12402242402), we get a palindrome (32826462823).

The spelling of 20424220421 in words is "twenty billion, four hundred twenty-four million, two hundred twenty thousand, four hundred twenty-one".