30212221 has 4 divisors (see below), whose sum is σ = 32536252. Its totient is φ = 27888192.

The previous prime is 30212219. The next prime is 30212227. The reversal of 30212221 is 12221203.

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 16112196 + 14100025 = 4014^2 + 3755^2 .

It is a cyclic number.

It is not a de Polignac number, because 30212221 - 2¹ = 30212219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 2324017 = 30212221 / (3 + 0 + 2 + 1 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30212227) 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, 1161996 + ... + 1162021.

It is an arithmetic number, because the mean of its divisors is an integer number (8134063).

Almost surely, 2^30212221 is an apocalyptic number.

It is an amenable number.

30212221 is a deficient number, since it is larger than the sum of its proper divisors (2324031).

30212221 is a wasteful number, since it uses less digits than its factorization.

30212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324030.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 30212221 is about 5496.5644724682. The cubic root of 30212221 is about 311.4542185422.

Adding to 30212221 its reverse (12221203), we get a palindrome (42433424).

The spelling of 30212221 in words is "thirty million, two hundred twelve thousand, two hundred twenty-one".