30223121 has 4 divisors (see below), whose sum is σ = 30718644. Its totient is φ = 29727600.

The previous prime is 30223111. The next prime is 30223147. The reversal of 30223121 is 12132203.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2016400 + 28206721 = 1420^2 + 5311^2 .

It is a cyclic number.

It is not a de Polignac number, because 30223121 - 2⁶ = 30223057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30223096 and 30223105.

It is not an unprimeable number, because it can be changed into a prime (30223111) 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, 247670 + ... + 247791.

It is an arithmetic number, because the mean of its divisors is an integer number (7679661).

Almost surely, 2^30223121 is an apocalyptic number.

It is an amenable number.

30223121 is a deficient number, since it is larger than the sum of its proper divisors (495523).

30223121 is an equidigital number, since it uses as much as digits as its factorization.

30223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495522.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 30223121 is about 5497.5559114938. Note that the first 3 decimals coincide. The cubic root of 30223121 is about 311.4916696430.

Adding to 30223121 its reverse (12132203), we get a palindrome (42355324).

The spelling of 30223121 in words is "thirty million, two hundred twenty-three thousand, one hundred twenty-one".