30442221 has 12 divisors (see below), whose sum is σ = 44106972. Its totient is φ = 20232576.

The previous prime is 30442219. The next prime is 30442259. The reversal of 30442221 is 12224403.

30442221 is a `hidden beast` number, since 3 + 0 + 442 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9180900 + 21261321 = 3030^2 + 4611^2 .

It is not a de Polignac number, because 30442221 - 2¹ = 30442219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30442194 and 30442203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30442201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1986 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (3675581).

Almost surely, 2^30442221 is an apocalyptic number.

It is an amenable number.

30442221 is a deficient number, since it is larger than the sum of its proper divisors (13664751).

30442221 is a wasteful number, since it uses less digits than its factorization.

30442221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10380 (or 10377 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 30442221 is about 5517.4469639499. The cubic root of 30442221 is about 312.2425690053.

Adding to 30442221 its reverse (12224403), we get a palindrome (42666624).

The spelling of 30442221 in words is "thirty million, four hundred forty-two thousand, two hundred twenty-one".