21450012079 has 2 divisors, whose sum is σ = 21450012080. Its totient is φ = 21450012078.

The previous prime is 21450012061. The next prime is 21450012127. The reversal of 21450012079 is 97021005412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21450012079 - 2¹⁷ = 21449881007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21450012079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450012049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725006039 + 10725006040.

It is an arithmetic number, because the mean of its divisors is an integer number (10725006040).

Almost surely, 2^21450012079 is an apocalyptic number.

21450012079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450012079 is an equidigital number, since it uses as much as digits as its factorization.

21450012079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 21450012079 in words is "twenty-one billion, four hundred fifty million, twelve thousand, seventy-nine".