21203430007 has 2 divisors, whose sum is σ = 21203430008. Its totient is φ = 21203430006.

The previous prime is 21203429987. The next prime is 21203430091. The reversal of 21203430007 is 70003430212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21203430007 - 2¹⁵ = 21203397239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21203430007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203430097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601715003 + 10601715004.

It is an arithmetic number, because the mean of its divisors is an integer number (10601715004).

Almost surely, 2^21203430007 is an apocalyptic number.

21203430007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203430007 is an equidigital number, since it uses as much as digits as its factorization.

21203430007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 22.

Adding to 21203430007 its reverse (70003430212), we get a palindrome (91206860219).

The spelling of 21203430007 in words is "twenty-one billion, two hundred three million, four hundred thirty thousand, seven".