69800021 has 2 divisors, whose sum is σ = 69800022. Its totient is φ = 69800020.

The previous prime is 69799979. The next prime is 69800047. The reversal of 69800021 is 12000896.

It is an a-pointer prime, because the next prime (69800047) can be obtained adding 69800021 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65431921 + 4368100 = 8089^2 + 2090^2 .

It is a cyclic number.

It is not a de Polignac number, because 69800021 - 2⁶ = 69799957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69800321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34900010 + 34900011.

It is an arithmetic number, because the mean of its divisors is an integer number (34900011).

Almost surely, 2^69800021 is an apocalyptic number.

It is an amenable number.

69800021 is a deficient number, since it is larger than the sum of its proper divisors (1).

69800021 is an equidigital number, since it uses as much as digits as its factorization.

69800021 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 26.

The square root of 69800021 is about 8354.6406864688. The cubic root of 69800021 is about 411.7356935033.

The spelling of 69800021 in words is "sixty-nine million, eight hundred thousand, twenty-one".