213833148721 has 6 divisors (see below), whose sum is σ = 227151476630. Its totient is φ = 201254727936.

The previous prime is 213833148701. The next prime is 213833148743. The reversal of 213833148721 is 127841338312.

213833148721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 76109774400 + 137723374321 = 275880^2 + 371111^2 .

It is not a de Polignac number, because 213833148721 - 2¹³ = 213833140529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213833148701) 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 5 ways as a sum of consecutive naturals, for example, 369953256 + ... + 369953833.

Almost surely, 2^213833148721 is an apocalyptic number.

It is an amenable number.

213833148721 is a deficient number, since it is larger than the sum of its proper divisors (13318327909).

213833148721 is an equidigital number, since it uses as much as digits as its factorization.

213833148721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739907123 (or 739907106 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The spelling of 213833148721 in words is "two hundred thirteen billion, eight hundred thirty-three million, one hundred forty-eight thousand, seven hundred twenty-one".