99057821 has 2 divisors, whose sum is σ = 99057822. Its totient is φ = 99057820.

The previous prime is 99057799. The next prime is 99057857. The reversal of 99057821 is 12875099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 42432196 = 7525^2 + 6514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99057821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99050821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49528910 + 49528911.

It is an arithmetic number, because the mean of its divisors is an integer number (49528911).

Almost surely, 2^99057821 is an apocalyptic number.

It is an amenable number.

99057821 is a deficient number, since it is larger than the sum of its proper divisors (1).

99057821 is an equidigital number, since it uses as much as digits as its factorization.

99057821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 99057821 is about 9952.7795615094. The cubic root of 99057821 is about 462.6965452439.

The spelling of 99057821 in words is "ninety-nine million, fifty-seven thousand, eight hundred twenty-one".