20124331421 has 4 divisors (see below), whose sum is σ = 20124692412. Its totient is φ = 20123970432.

The previous prime is 20124331397. The next prime is 20124331433. The reversal of 20124331421 is 12413342102.

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 5219340025 + 14904991396 = 72245^2 + 122086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20124331421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20124331471) 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, 77150 + ... + 214943.

It is an arithmetic number, because the mean of its divisors is an integer number (5031173103).

Almost surely, 2^20124331421 is an apocalyptic number.

It is an amenable number.

20124331421 is a deficient number, since it is larger than the sum of its proper divisors (360991).

20124331421 is an equidigital number, since it uses as much as digits as its factorization.

20124331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360990.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20124331421 its reverse (12413342102), we get a palindrome (32537673523).

The spelling of 20124331421 in words is "twenty billion, one hundred twenty-four million, three hundred thirty-one thousand, four hundred twenty-one".