93820021 has 2 divisors, whose sum is σ = 93820022. Its totient is φ = 93820020.

The previous prime is 93820019. The next prime is 93820031. The reversal of 93820021 is 12002839.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92640625 + 1179396 = 9625^2 + 1086^2 .

It is a cyclic number.

It is not a de Polignac number, because 93820021 - 2¹ = 93820019 is a prime.

Together with 93820019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (93820031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46910010 + 46910011.

It is an arithmetic number, because the mean of its divisors is an integer number (46910011).

Almost surely, 2^93820021 is an apocalyptic number.

It is an amenable number.

93820021 is a deficient number, since it is larger than the sum of its proper divisors (1).

93820021 is an equidigital number, since it uses as much as digits as its factorization.

93820021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 93820021 is about 9686.0735594977. The cubic root of 93820021 is about 454.3932192630.

The spelling of 93820021 in words is "ninety-three million, eight hundred twenty thousand, twenty-one".