73057318021 has 4 divisors (see below), whose sum is σ = 73061646912. Its totient is φ = 73052989132.

The previous prime is 73057317953. The next prime is 73057318043. The reversal of 73057318021 is 12081375037.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73057318021 - 2¹¹ = 73057315973 is a prime.

It is a super-3 number, since 3×73057318021³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73057318051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2139031 + ... + 2172916.

It is an arithmetic number, because the mean of its divisors is an integer number (18265411728).

Almost surely, 2^73057318021 is an apocalyptic number.

It is an amenable number.

73057318021 is a deficient number, since it is larger than the sum of its proper divisors (4328891).

73057318021 is a wasteful number, since it uses less digits than its factorization.

73057318021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328890.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 73057318021 in words is "seventy-three billion, fifty-seven million, three hundred eighteen thousand, twenty-one".