30221557 has 2 divisors, whose sum is σ = 30221558. Its totient is φ = 30221556.

The previous prime is 30221549. The next prime is 30221591. The reversal of 30221557 is 75512203.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21613201 + 8608356 = 4649^2 + 2934^2 .

It is a cyclic number.

It is not a de Polignac number, because 30221557 - 2³ = 30221549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30221507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15110778 + 15110779.

It is an arithmetic number, because the mean of its divisors is an integer number (15110779).

Almost surely, 2^30221557 is an apocalyptic number.

It is an amenable number.

30221557 is a deficient number, since it is larger than the sum of its proper divisors (1).

30221557 is an equidigital number, since it uses as much as digits as its factorization.

30221557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 30221557 is about 5497.4136646245. The cubic root of 30221557 is about 311.4862964788.

The spelling of 30221557 in words is "thirty million, two hundred twenty-one thousand, five hundred fifty-seven".