73132421 has 4 divisors (see below), whose sum is σ = 74512332. Its totient is φ = 71752512.

The previous prime is 73132399. The next prime is 73132427. The reversal of 73132421 is 12423137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12423137 = 179 ⋅69403.

It can be written as a sum of positive squares in 2 ways, for example, as 29757025 + 43375396 = 5455^2 + 6586^2 .

It is a cyclic number.

It is not a de Polignac number, because 73132421 - 2¹⁸ = 72870277 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 (73132427) 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, 689876 + ... + 689981.

It is an arithmetic number, because the mean of its divisors is an integer number (18628083).

Almost surely, 2^73132421 is an apocalyptic number.

It is an amenable number.

73132421 is a deficient number, since it is larger than the sum of its proper divisors (1379911).

73132421 is a wasteful number, since it uses less digits than its factorization.

73132421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379910.

The product of its digits is 1008, while the sum is 23.

The square root of 73132421 is about 8551.7495870728. The cubic root of 73132421 is about 418.1864757902.

Adding to 73132421 its reverse (12423137), we get a palindrome (85555558).

The spelling of 73132421 in words is "seventy-three million, one hundred thirty-two thousand, four hundred twenty-one".