20003521243 has 2 divisors, whose sum is σ = 20003521244. Its totient is φ = 20003521242.

The previous prime is 20003521217. The next prime is 20003521261. The reversal of 20003521243 is 34212530002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20003521243 - 2⁹ = 20003520731 is a prime.

It is not a weakly prime, because it can be changed into another prime (20003528243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001760621 + 10001760622.

It is an arithmetic number, because the mean of its divisors is an integer number (10001760622).

Almost surely, 2^20003521243 is an apocalyptic number.

20003521243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003521243 is an equidigital number, since it uses as much as digits as its factorization.

20003521243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 22.

The spelling of 20003521243 in words is "twenty billion, three million, five hundred twenty-one thousand, two hundred forty-three".