73190821 has 4 divisors (see below), whose sum is σ = 79844544. Its totient is φ = 66537100.

The previous prime is 73190791. The next prime is 73190849. The reversal of 73190821 is 12809137.

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 73190821 - 2¹⁹ = 72666533 is a prime.

It is a Smith number, since the sum of its digits (31) 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (73190881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3326845 + ... + 3326866.

It is an arithmetic number, because the mean of its divisors is an integer number (19961136).

Almost surely, 2^73190821 is an apocalyptic number.

It is an amenable number.

73190821 is a deficient number, since it is larger than the sum of its proper divisors (6653723).

73190821 is a wasteful number, since it uses less digits than its factorization.

73190821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6653722.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 73190821 is about 8555.1634116480. The cubic root of 73190821 is about 418.2977606438.

Adding to 73190821 its reverse (12809137), we get a palindrome (85999958).

The spelling of 73190821 in words is "seventy-three million, one hundred ninety thousand, eight hundred twenty-one".