70320421 has 2 divisors, whose sum is σ = 70320422. Its totient is φ = 70320420.

The previous prime is 70320379. The next prime is 70320433. The reversal of 70320421 is 12402307.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68707521 + 1612900 = 8289^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 70320421 - 2²¹ = 68223269 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 (70320451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35160210 + 35160211.

It is an arithmetic number, because the mean of its divisors is an integer number (35160211).

Almost surely, 2^70320421 is an apocalyptic number.

It is an amenable number.

70320421 is a deficient number, since it is larger than the sum of its proper divisors (1).

70320421 is an equidigital number, since it uses as much as digits as its factorization.

70320421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 70320421 is about 8385.7272195082. The cubic root of 70320421 is about 412.7564045318.

Adding to 70320421 its reverse (12402307), we get a palindrome (82722728).

The spelling of 70320421 in words is "seventy million, three hundred twenty thousand, four hundred twenty-one".