21128430007 has 2 divisors, whose sum is σ = 21128430008. Its totient is φ = 21128430006.

The previous prime is 21128429983. The next prime is 21128430031. The reversal of 21128430007 is 70003482112.

It is a balanced prime because it is at equal distance from previous prime (21128429983) and next prime (21128430031).

It is a cyclic number.

It is not a de Polignac number, because 21128430007 - 2¹⁵ = 21128397239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21128430107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10564215003 + 10564215004.

It is an arithmetic number, because the mean of its divisors is an integer number (10564215004).

Almost surely, 2^21128430007 is an apocalyptic number.

21128430007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21128430007 is an equidigital number, since it uses as much as digits as its factorization.

21128430007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The spelling of 21128430007 in words is "twenty-one billion, one hundred twenty-eight million, four hundred thirty thousand, seven".