30055021 has 2 divisors, whose sum is σ = 30055022. Its totient is φ = 30055020.

The previous prime is 30055001. The next prime is 30055037. The reversal of 30055021 is 12055003.

It is an a-pointer prime, because the next prime (30055037) can be obtained adding 30055021 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 14333796 = 3965^2 + 3786^2 .

It is a cyclic number.

It is not a de Polignac number, because 30055021 - 2¹⁵ = 30022253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30054986 and 30055004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30055001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15027510 + 15027511.

It is an arithmetic number, because the mean of its divisors is an integer number (15027511).

Almost surely, 2^30055021 is an apocalyptic number.

It is an amenable number.

30055021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30055021 is an equidigital number, since it uses as much as digits as its factorization.

30055021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 30055021 is about 5482.2459813474. The cubic root of 30055021 is about 310.9130935162.

The spelling of 30055021 in words is "thirty million, fifty-five thousand, twenty-one".