73220421 has 16 divisors (see below), whose sum is σ = 98993664. Its totient is φ = 48135024.

The previous prime is 73220417. The next prime is 73220429. The reversal of 73220421 is 12402237.

It is not a de Polignac number, because 73220421 - 2² = 73220417 is a prime.

It is a super-2 number, since 2×73220421² = 10722460102834482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73220429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98176 + ... + 98918.

It is an arithmetic number, because the mean of its divisors is an integer number (6187104).

Almost surely, 2^73220421 is an apocalyptic number.

It is an amenable number.

73220421 is a deficient number, since it is larger than the sum of its proper divisors (25773243).

73220421 is a wasteful number, since it uses less digits than its factorization.

73220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 73220421 is about 8556.8931861979. The cubic root of 73220421 is about 418.3541426910.

Adding to 73220421 its reverse (12402237), we get a palindrome (85622658).

The spelling of 73220421 in words is "seventy-three million, two hundred twenty thousand, four hundred twenty-one".