69842021 has 2 divisors, whose sum is σ = 69842022. Its totient is φ = 69842020.

The previous prime is 69842009. The next prime is 69842029. The reversal of 69842021 is 12024896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59505796 + 10336225 = 7714^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 69842021 - 2⁶ = 69841957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69842029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34921010 + 34921011.

It is an arithmetic number, because the mean of its divisors is an integer number (34921011).

Almost surely, 2^69842021 is an apocalyptic number.

It is an amenable number.

69842021 is a deficient number, since it is larger than the sum of its proper divisors (1).

69842021 is an equidigital number, since it uses as much as digits as its factorization.

69842021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 69842021 is about 8357.1538815556. The cubic root of 69842021 is about 411.8182600104.

The spelling of 69842021 in words is "sixty-nine million, eight hundred forty-two thousand, twenty-one".