20203221431 has 2 divisors, whose sum is σ = 20203221432. Its totient is φ = 20203221430.

The previous prime is 20203221391. The next prime is 20203221439. The reversal of 20203221431 is 13412230202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20203221431 - 2²² = 20199027127 is a prime.

It is a super-2 number, since 2×20203221431² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20203221439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101610715 + 10101610716.

It is an arithmetic number, because the mean of its divisors is an integer number (10101610716).

Almost surely, 2^20203221431 is an apocalyptic number.

20203221431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203221431 is an equidigital number, since it uses as much as digits as its factorization.

20203221431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20203221431 its reverse (13412230202), we get a palindrome (33615451633).

The spelling of 20203221431 in words is "twenty billion, two hundred three million, two hundred twenty-one thousand, four hundred thirty-one".