30397021 has 4 divisors (see below), whose sum is σ = 30408352. Its totient is φ = 30385692.

The previous prime is 30397013. The next prime is 30397027. The reversal of 30397021 is 12079303.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 30397021 - 2³ = 30397013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30397027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880 + ... + 7846.

It is an arithmetic number, because the mean of its divisors is an integer number (7602088).

Almost surely, 2^30397021 is an apocalyptic number.

It is an amenable number.

30397021 is a deficient number, since it is larger than the sum of its proper divisors (11331).

30397021 is an equidigital number, since it uses as much as digits as its factorization.

30397021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11330.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 30397021 is about 5513.3493449989. The cubic root of 30397021 is about 312.0879552867.

The spelling of 30397021 in words is "thirty million, three hundred ninety-seven thousand, twenty-one".