73230021 has 8 divisors (see below), whose sum is σ = 108488960. Its totient is φ = 48819996.

The previous prime is 73230007. The next prime is 73230037. The reversal of 73230021 is 12003237.

It is not a de Polignac number, because 73230021 - 2¹³ = 73221829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 73229976 and 73230003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73230041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356085 + ... + 1356138.

It is an arithmetic number, because the mean of its divisors is an integer number (13561120).

Almost surely, 2^73230021 is an apocalyptic number.

It is an amenable number.

73230021 is a deficient number, since it is larger than the sum of its proper divisors (35258939).

73230021 is a wasteful number, since it uses less digits than its factorization.

73230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712232 (or 2712226 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 73230021 is about 8557.4541190707. The cubic root of 73230021 is about 418.3724254970.

Adding to 73230021 its reverse (12003237), we get a palindrome (85233258).

The spelling of 73230021 in words is "seventy-three million, two hundred thirty thousand, twenty-one".