30355021 has 2 divisors, whose sum is σ = 30355022. Its totient is φ = 30355020.

The previous prime is 30355019. The next prime is 30355037. The reversal of 30355021 is 12055303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 1999396 = 5325^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 30355021 - 2¹ = 30355019 is a prime.

Together with 30355019, 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 30355021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30355051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15177510 + 15177511.

It is an arithmetic number, because the mean of its divisors is an integer number (15177511).

Almost surely, 2^30355021 is an apocalyptic number.

It is an amenable number.

30355021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30355021 is an equidigital number, since it uses as much as digits as its factorization.

30355021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 30355021 is about 5509.5390914304. The cubic root of 30355021 is about 311.9441502322.

The spelling of 30355021 in words is "thirty million, three hundred fifty-five thousand, twenty-one".