73051421 has 4 divisors (see below), whose sum is σ = 73070844. Its totient is φ = 73032000.

The previous prime is 73051417. The next prime is 73051423. The reversal of 73051421 is 12415037.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 290521 + 72760900 = 539^2 + 8530^2 .

It is a cyclic number.

It is not a de Polignac number, because 73051421 - 2² = 73051417 is a prime.

It is a super-2 number, since 2×73051421² = 10673020220238482, which contains 22 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 (73051423) 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, 2060 + ... + 12261.

It is an arithmetic number, because the mean of its divisors is an integer number (18267711).

Almost surely, 2^73051421 is an apocalyptic number.

It is an amenable number.

73051421 is a deficient number, since it is larger than the sum of its proper divisors (19423).

73051421 is a wasteful number, since it uses less digits than its factorization.

73051421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19422.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 73051421 is about 8547.0124020034. The cubic root of 73051421 is about 418.0320271088.

Adding to 73051421 its reverse (12415037), we get a palindrome (85466458).

The spelling of 73051421 in words is "seventy-three million, fifty-one thousand, four hundred twenty-one".