30021231 has 4 divisors (see below), whose sum is σ = 40028312. Its totient is φ = 20014152.

The previous prime is 30021227. The next prime is 30021241. The reversal of 30021231 is 13212003.

It is a happy number.

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

It is not a de Polignac number, because 30021231 - 2² = 30021227 is a prime.

It is a super-2 number, since 2×30021231² = 1802548621510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30021241) 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, 5003536 + ... + 5003541.

It is an arithmetic number, because the mean of its divisors is an integer number (10007078).

Almost surely, 2^30021231 is an apocalyptic number.

30021231 is a deficient number, since it is larger than the sum of its proper divisors (10007081).

30021231 is a wasteful number, since it uses less digits than its factorization.

30021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10007080.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 30021231 is about 5479.1633485415. The cubic root of 30021231 is about 310.7965329256.

Adding to 30021231 its reverse (13212003), we get a palindrome (43233234).

The spelling of 30021231 in words is "thirty million, twenty-one thousand, two hundred thirty-one".