21450012099 has 4 divisors (see below), whose sum is σ = 28600016136. Its totient is φ = 14300008064.

The previous prime is 21450012079. The next prime is 21450012127. The reversal of 21450012099 is 99021005412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21450012099 - 2¹⁶ = 21449946563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21450012049) 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 in 3 ways as a sum of consecutive naturals, for example, 3575002014 + ... + 3575002019.

It is an arithmetic number, because the mean of its divisors is an integer number (7150004034).

Almost surely, 2^21450012099 is an apocalyptic number.

21450012099 is a deficient number, since it is larger than the sum of its proper divisors (7150004037).

21450012099 is an equidigital number, since it uses as much as digits as its factorization.

21450012099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7150004036.

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 21450012099 in words is "twenty-one billion, four hundred fifty million, twelve thousand, ninety-nine".