30124921 has 2 divisors, whose sum is σ = 30124922. Its totient is φ = 30124920.

The previous prime is 30124909. The next prime is 30124949. The reversal of 30124921 is 12942103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 11634921 = 4300^2 + 3411^2 .

It is a cyclic number.

It is not a de Polignac number, because 30124921 - 2⁵ = 30124889 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30124892 and 30124901.

It is not a weakly prime, because it can be changed into another prime (30124961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15062460 + 15062461.

It is an arithmetic number, because the mean of its divisors is an integer number (15062461).

Almost surely, 2^30124921 is an apocalyptic number.

It is an amenable number.

30124921 is a deficient number, since it is larger than the sum of its proper divisors (1).

30124921 is an equidigital number, since it uses as much as digits as its factorization.

30124921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 30124921 is about 5488.6174033175. The cubic root of 30124921 is about 311.1539406691.

The spelling of 30124921 in words is "thirty million, one hundred twenty-four thousand, nine hundred twenty-one".