30672221 has 2 divisors, whose sum is σ = 30672222. Its totient is φ = 30672220.

The previous prime is 30672217. The next prime is 30672253. The reversal of 30672221 is 12227603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15888196 + 14784025 = 3986^2 + 3845^2 .

It is a cyclic number.

It is not a de Polignac number, because 30672221 - 2² = 30672217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30672281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15336110 + 15336111.

It is an arithmetic number, because the mean of its divisors is an integer number (15336111).

Almost surely, 2^30672221 is an apocalyptic number.

It is an amenable number.

30672221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30672221 is an equidigital number, since it uses as much as digits as its factorization.

30672221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 30672221 is about 5538.2507166072. The cubic root of 30672221 is about 313.0269585874.

Adding to 30672221 its reverse (12227603), we get a palindrome (42899824).

It can be divided in two parts, 306 and 72221, that added together give a palindrome (72527).

The spelling of 30672221 in words is "thirty million, six hundred seventy-two thousand, two hundred twenty-one".