21203143207 has 2 divisors, whose sum is σ = 21203143208. Its totient is φ = 21203143206.

The previous prime is 21203143163. The next prime is 21203143237. The reversal of 21203143207 is 70234130212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203143207 - 2²³ = 21194754599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203143237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601571603 + 10601571604.

It is an arithmetic number, because the mean of its divisors is an integer number (10601571604).

Almost surely, 2^21203143207 is an apocalyptic number.

21203143207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203143207 is an equidigital number, since it uses as much as digits as its factorization.

21203143207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 21203143207 its reverse (70234130212), we get a palindrome (91437273419).

The spelling of 21203143207 in words is "twenty-one billion, two hundred three million, one hundred forty-three thousand, two hundred seven".