70017421 has 2 divisors, whose sum is σ = 70017422. Its totient is φ = 70017420.

The previous prime is 70017419. The next prime is 70017433. The reversal of 70017421 is 12471007.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47073321 + 22944100 = 6861^2 + 4790^2 .

It is a cyclic number.

It is not a de Polignac number, because 70017421 - 2¹ = 70017419 is a prime.

Together with 70017419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 70017392 and 70017401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70017481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35008710 + 35008711.

It is an arithmetic number, because the mean of its divisors is an integer number (35008711).

Almost surely, 2^70017421 is an apocalyptic number.

It is an amenable number.

70017421 is a deficient number, since it is larger than the sum of its proper divisors (1).

70017421 is an equidigital number, since it uses as much as digits as its factorization.

70017421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 70017421 is about 8367.6413044537. The cubic root of 70017421 is about 412.1627161504.

Adding to 70017421 its reverse (12471007), we get a palindrome (82488428).

The spelling of 70017421 in words is "seventy million, seventeen thousand, four hundred twenty-one".