30221897 has 2 divisors, whose sum is σ = 30221898. Its totient is φ = 30221896.

The previous prime is 30221887. The next prime is 30221899. The reversal of 30221897 is 79812203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23775376 + 6446521 = 4876^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 30221897 - 2⁶ = 30221833 is a prime.

Together with 30221899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30221899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15110948 + 15110949.

It is an arithmetic number, because the mean of its divisors is an integer number (15110949).

Almost surely, 2^30221897 is an apocalyptic number.

It is an amenable number.

30221897 is a deficient number, since it is larger than the sum of its proper divisors (1).

30221897 is an equidigital number, since it uses as much as digits as its factorization.

30221897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 30221897 is about 5497.4445881700. Note that the first 3 decimals coincide. The cubic root of 30221897 is about 311.4874645737.

The spelling of 30221897 in words is "thirty million, two hundred twenty-one thousand, eight hundred ninety-seven".