73162021 has 4 divisors (see below), whose sum is σ = 74192544. Its totient is φ = 72131500.

The previous prime is 73162013. The next prime is 73162031. The reversal of 73162021 is 12026137.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12026137 = 2719 ⋅4423.

It is a cyclic number.

It is not a de Polignac number, because 73162021 - 2³ = 73162013 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73161983 and 73162001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73162031) 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, 515155 + ... + 515296.

It is an arithmetic number, because the mean of its divisors is an integer number (18548136).

Almost surely, 2^73162021 is an apocalyptic number.

73162021 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

73162021 is a deficient number, since it is larger than the sum of its proper divisors (1030523).

73162021 is a wasteful number, since it uses less digits than its factorization.

73162021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030522.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 73162021 is about 8553.4800520022. The cubic root of 73162021 is about 418.2428878432.

Adding to 73162021 its reverse (12026137), we get a palindrome (85188158).

The spelling of 73162021 in words is "seventy-three million, one hundred sixty-two thousand, twenty-one".