30621223 has 2 divisors, whose sum is σ = 30621224. Its totient is φ = 30621222.

The previous prime is 30621221. The next prime is 30621263. The reversal of 30621223 is 32212603.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30621223 - 2¹ = 30621221 is a prime.

Together with 30621221, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 30621223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30621221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15310611 + 15310612.

It is an arithmetic number, because the mean of its divisors is an integer number (15310612).

Almost surely, 2^30621223 is an apocalyptic number.

30621223 is a deficient number, since it is larger than the sum of its proper divisors (1).

30621223 is an equidigital number, since it uses as much as digits as its factorization.

30621223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 30621223 is about 5533.6446398373. The cubic root of 30621223 is about 312.8533747601.

Adding to 30621223 its reverse (32212603), we get a palindrome (62833826).

The spelling of 30621223 in words is "thirty million, six hundred twenty-one thousand, two hundred twenty-three".