30268921 has 2 divisors, whose sum is σ = 30268922. Its totient is φ = 30268920.

The previous prime is 30268879. The next prime is 30268949. The reversal of 30268921 is 12986203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 10368400 = 4461^2 + 3220^2 .

It is an emirp because it is prime and its reverse (12986203) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30268921 is a prime.

It is not a weakly prime, because it can be changed into another prime (30268981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15134460 + 15134461.

It is an arithmetic number, because the mean of its divisors is an integer number (15134461).

Almost surely, 2^30268921 is an apocalyptic number.

It is an amenable number.

30268921 is a deficient number, since it is larger than the sum of its proper divisors (1).

30268921 is an equidigital number, since it uses as much as digits as its factorization.

30268921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 30268921 is about 5501.7198220193. The cubic root of 30268921 is about 311.6489346516.

The spelling of 30268921 in words is "thirty million, two hundred sixty-eight thousand, nine hundred twenty-one".