73557421 has 4 divisors (see below), whose sum is σ = 84065632. Its totient is φ = 63049212.

The previous prime is 73557383. The next prime is 73557431. The reversal of 73557421 is 12475537.

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: 12475537 = 61 ⋅204517.

It is a cyclic number.

It is not a de Polignac number, because 73557421 - 2⁷ = 73557293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73557431) 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, 5254095 + ... + 5254108.

It is an arithmetic number, because the mean of its divisors is an integer number (21016408).

Almost surely, 2^73557421 is an apocalyptic number.

It is an amenable number.

73557421 is a deficient number, since it is larger than the sum of its proper divisors (10508211).

73557421 is a wasteful number, since it uses less digits than its factorization.

73557421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10508210.

The product of its digits is 29400, while the sum is 34.

The square root of 73557421 is about 8576.5623066588. The cubic root of 73557421 is about 418.9949912347.

The spelling of 73557421 in words is "seventy-three million, five hundred fifty-seven thousand, four hundred twenty-one".