84210281 has 2 divisors, whose sum is σ = 84210282. Its totient is φ = 84210280.

The previous prime is 84210277. The next prime is 84210283. The reversal of 84210281 is 18201248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79370281 + 4840000 = 8909^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 84210281 - 2² = 84210277 is a prime.

It is a super-2 number, since 2×84210281² = 14182742852197922, which contains 22 as substring.

Together with 84210283, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84210281.

It is not a weakly prime, because it can be changed into another prime (84210283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42105140 + 42105141.

It is an arithmetic number, because the mean of its divisors is an integer number (42105141).

Almost surely, 2^84210281 is an apocalyptic number.

It is an amenable number.

84210281 is a deficient number, since it is larger than the sum of its proper divisors (1).

84210281 is an equidigital number, since it uses as much as digits as its factorization.

84210281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 84210281 is about 9176.6159884785. The cubic root of 84210281 is about 438.3170577439.

The spelling of 84210281 in words is "eighty-four million, two hundred ten thousand, two hundred eighty-one".