84730421 has 2 divisors, whose sum is σ = 84730422. Its totient is φ = 84730420.

The previous prime is 84730381. The next prime is 84730441. The reversal of 84730421 is 12403748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81252196 + 3478225 = 9014^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 84730421 - 2⁶ = 84730357 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 (84730441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42365210 + 42365211.

It is an arithmetic number, because the mean of its divisors is an integer number (42365211).

Almost surely, 2^84730421 is an apocalyptic number.

It is an amenable number.

84730421 is a deficient number, since it is larger than the sum of its proper divisors (1).

84730421 is an equidigital number, since it uses as much as digits as its factorization.

84730421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 84730421 is about 9204.9128730260. The cubic root of 84730421 is about 439.2176541892.

The spelling of 84730421 in words is "eighty-four million, seven hundred thirty thousand, four hundred twenty-one".