30011221 has 4 divisors (see below), whose sum is σ = 30743244. Its totient is φ = 29279200.

The previous prime is 30011161. The next prime is 30011269. The reversal of 30011221 is 12211003.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12211003 = 7 ⋅1744429.

It can be written as a sum of positive squares in 2 ways, for example, as 13608721 + 16402500 = 3689^2 + 4050^2 .

It is a cyclic number.

It is not a de Polignac number, because 30011221 - 2²³ = 21622613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30011198 and 30011207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30011281) 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, 365950 + ... + 366031.

It is an arithmetic number, because the mean of its divisors is an integer number (7685811).

Almost surely, 2^30011221 is an apocalyptic number.

It is an amenable number.

30011221 is a deficient number, since it is larger than the sum of its proper divisors (732023).

30011221 is an equidigital number, since it uses as much as digits as its factorization.

30011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732022.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 30011221 is about 5478.2498117556. The cubic root of 30011221 is about 310.7619860507.

Adding to 30011221 its reverse (12211003), we get a palindrome (42222224).

The spelling of 30011221 in words is "thirty million, eleven thousand, two hundred twenty-one".