730321211221 has 4 divisors (see below), whose sum is σ = 834652812832. Its totient is φ = 625989609612.

The previous prime is 730321211209. The next prime is 730321211227. The reversal of 730321211221 is 122112123037.

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: 122112123037 = 17 ⋅7183066061.

It is a cyclic number.

It is not a de Polignac number, because 730321211221 - 2¹⁷ = 730321080149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730321211227) 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, 52165800795 + ... + 52165800808.

It is an arithmetic number, because the mean of its divisors is an integer number (208663203208).

Almost surely, 2^730321211221 is an apocalyptic number.

It is an amenable number.

730321211221 is a deficient number, since it is larger than the sum of its proper divisors (104331601611).

730321211221 is a wasteful number, since it uses less digits than its factorization.

730321211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104331601610.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 730321211221 its reverse (122112123037), we get a palindrome (852433334258).

The spelling of 730321211221 in words is "seven hundred thirty billion, three hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".