69680021 has 2 divisors, whose sum is σ = 69680022. Its totient is φ = 69680020.

The previous prime is 69679943. The next prime is 69680027. The reversal of 69680021 is 12008696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37075921 + 32604100 = 6089^2 + 5710^2 .

It is a cyclic number.

It is not a de Polignac number, because 69680021 - 2¹⁰ = 69678997 is a prime.

It is a super-3 number, since 3×69680021³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 69680021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69680027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34840010 + 34840011.

It is an arithmetic number, because the mean of its divisors is an integer number (34840011).

Almost surely, 2^69680021 is an apocalyptic number.

It is an amenable number.

69680021 is a deficient number, since it is larger than the sum of its proper divisors (1).

69680021 is an equidigital number, since it uses as much as digits as its factorization.

69680021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 69680021 is about 8347.4559597520. The cubic root of 69680021 is about 411.4996065424.

The spelling of 69680021 in words is "sixty-nine million, six hundred eighty thousand, twenty-one".