73220621 has 8 divisors (see below), whose sum is σ = 75841920. Its totient is φ = 70605808.

The previous prime is 73220611. The next prime is 73220633. The reversal of 73220621 is 12602237.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73220621 - 2¹⁸ = 72958477 is a prime.

It is a super-2 number, since 2×73220621² = 10722518679251282, 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 (73220611) 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 7 ways as a sum of consecutive naturals, for example, 38720 + ... + 40566.

It is an arithmetic number, because the mean of its divisors is an integer number (9480240).

Almost surely, 2^73220621 is an apocalyptic number.

It is an amenable number.

73220621 is a deficient number, since it is larger than the sum of its proper divisors (2621299).

73220621 is a wasteful number, since it uses less digits than its factorization.

73220621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243.

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

The square root of 73220621 is about 8556.9048726745. The cubic root of 73220621 is about 418.3545235991.

Adding to 73220621 its reverse (12602237), we get a palindrome (85822858).

The spelling of 73220621 in words is "seventy-three million, two hundred twenty thousand, six hundred twenty-one".