89102021 has 2 divisors, whose sum is σ = 89102022. Its totient is φ = 89102020.

The previous prime is 89102017. The next prime is 89102081. The reversal of 89102021 is 12020198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84088900 + 5013121 = 9170^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 89102021 - 2² = 89102017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89102011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44551010 + 44551011.

It is an arithmetic number, because the mean of its divisors is an integer number (44551011).

Almost surely, 2^89102021 is an apocalyptic number.

It is an amenable number.

89102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

89102021 is an equidigital number, since it uses as much as digits as its factorization.

89102021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 89102021 is about 9439.3866855850. The cubic root of 89102021 is about 446.6450428258.

The spelling of 89102021 in words is "eighty-nine million, one hundred two thousand, twenty-one".