69850021 has 2 divisors, whose sum is σ = 69850022. Its totient is φ = 69850020.

The previous prime is 69849973. The next prime is 69850031. The reversal of 69850021 is 12005896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66748900 + 3101121 = 8170^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 69850021 - 2¹⁹ = 69325733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69850031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34925010 + 34925011.

It is an arithmetic number, because the mean of its divisors is an integer number (34925011).

Almost surely, 2^69850021 is an apocalyptic number.

It is an amenable number.

69850021 is a deficient number, since it is larger than the sum of its proper divisors (1).

69850021 is an equidigital number, since it uses as much as digits as its factorization.

69850021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 69850021 is about 8357.6324996975. The cubic root of 69850021 is about 411.8339832109.

The spelling of 69850021 in words is "sixty-nine million, eight hundred fifty thousand, twenty-one".