20235315421 has 4 divisors (see below), whose sum is σ = 20240598492. Its totient is φ = 20230032352.

The previous prime is 20235315377. The next prime is 20235315437. The reversal of 20235315421 is 12451353202.

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 6260765625 + 13974549796 = 79125^2 + 118214^2 .

It is a cyclic number.

It is not a de Polignac number, because 20235315421 - 2⁹ = 20235314909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20235315421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20235315481) 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, 2635786 + ... + 2643451.

It is an arithmetic number, because the mean of its divisors is an integer number (5060149623).

Almost surely, 2^20235315421 is an apocalyptic number.

It is an amenable number.

20235315421 is a deficient number, since it is larger than the sum of its proper divisors (5283071).

20235315421 is an equidigital number, since it uses as much as digits as its factorization.

20235315421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5283070.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20235315421 its reverse (12451353202), we get a palindrome (32686668623).

The spelling of 20235315421 in words is "twenty billion, two hundred thirty-five million, three hundred fifteen thousand, four hundred twenty-one".