30051221 has 4 divisors (see below), whose sum is σ = 31087500. Its totient is φ = 29014944.

The previous prime is 30051211. The next prime is 30051227. The reversal of 30051221 is 12215003.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12215003 = 29 ⋅421207.

It can be written as a sum of positive squares in 2 ways, for example, as 17724100 + 12327121 = 4210^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 30051221 - 2¹⁰ = 30050197 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 = 30051196 and 30051205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30051227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518096 + ... + 518153.

It is an arithmetic number, because the mean of its divisors is an integer number (7771875).

Almost surely, 2^30051221 is an apocalyptic number.

It is an amenable number.

30051221 is a deficient number, since it is larger than the sum of its proper divisors (1036279).

30051221 is a wasteful number, since it uses less digits than its factorization.

30051221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036278.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 30051221 is about 5481.8993971068. The cubic root of 30051221 is about 310.8999895543.

Adding to 30051221 its reverse (12215003), we get a palindrome (42266224).

The spelling of 30051221 in words is "thirty million, fifty-one thousand, two hundred twenty-one".