30077921 has 2 divisors, whose sum is σ = 30077922. Its totient is φ = 30077920.

The previous prime is 30077899. The next prime is 30077933. The reversal of 30077921 is 12977003.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 13957696 = 4015^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 30077921 - 2¹⁰ = 30076897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30077221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15038960 + 15038961.

It is an arithmetic number, because the mean of its divisors is an integer number (15038961).

Almost surely, 2^30077921 is an apocalyptic number.

It is an amenable number.

30077921 is a deficient number, since it is larger than the sum of its proper divisors (1).

30077921 is an equidigital number, since it uses as much as digits as its factorization.

30077921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 30077921 is about 5484.3341437225. The cubic root of 30077921 is about 310.9920387536.

The spelling of 30077921 in words is "thirty million, seventy-seven thousand, nine hundred twenty-one".