20124403213 has 4 divisors (see below), whose sum is σ = 20504108988. Its totient is φ = 19744697440.

The previous prime is 20124403171. The next prime is 20124403237. The reversal of 20124403213 is 31230442102.

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 17845486569 + 2278916644 = 133587^2 + 47738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20124403213 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 (20124403283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189852808 + ... + 189852913.

It is an arithmetic number, because the mean of its divisors is an integer number (5126027247).

Almost surely, 2^20124403213 is an apocalyptic number.

It is an amenable number.

20124403213 is a deficient number, since it is larger than the sum of its proper divisors (379705775).

20124403213 is an equidigital number, since it uses as much as digits as its factorization.

20124403213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379705774.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20124403213 its reverse (31230442102), we get a palindrome (51354845315).

The spelling of 20124403213 in words is "twenty billion, one hundred twenty-four million, four hundred three thousand, two hundred thirteen".