21152212054599 has 4 divisors (see below), whose sum is σ = 28202949406136. Its totient is φ = 14101474703064.

The previous prime is 21152212054579. The next prime is 21152212054607. The reversal of 21152212054599 is 99545021225112.

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

It is not a de Polignac number, because 21152212054599 - 2⁹ = 21152212054087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152212054529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3525368675764 + ... + 3525368675769.

It is an arithmetic number, because the mean of its divisors is an integer number (7050737351534).

Almost surely, 2^{21152212054599} is an apocalyptic number.

21152212054599 is a deficient number, since it is larger than the sum of its proper divisors (7050737351537).

21152212054599 is an equidigital number, since it uses as much as digits as its factorization.

21152212054599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7050737351536.

The product of its (nonzero) digits is 648000, while the sum is 48.

The spelling of 21152212054599 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred twelve million, fifty-four thousand, five hundred ninety-nine".