70207421 has 2 divisors, whose sum is σ = 70207422. Its totient is φ = 70207420.

The previous prime is 70207391. The next prime is 70207439. The reversal of 70207421 is 12470207.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40896025 + 29311396 = 6395^2 + 5414^2 .

It is a cyclic number.

It is not a de Polignac number, because 70207421 - 2²² = 66013117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70207471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35103710 + 35103711.

It is an arithmetic number, because the mean of its divisors is an integer number (35103711).

Almost surely, 2^70207421 is an apocalyptic number.

It is an amenable number.

70207421 is a deficient number, since it is larger than the sum of its proper divisors (1).

70207421 is an equidigital number, since it uses as much as digits as its factorization.

70207421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 70207421 is about 8378.9868719315. The cubic root of 70207421 is about 412.5351957725.

Adding to 70207421 its reverse (12470207), we get a palindrome (82677628).

It can be divided in two parts, 7020 and 7421, that added together give a palindrome (14441).

The spelling of 70207421 in words is "seventy million, two hundred seven thousand, four hundred twenty-one".