421240357 has 2 divisors, whose sum is σ = 421240358. Its totient is φ = 421240356.

The previous prime is 421240333. The next prime is 421240361. The reversal of 421240357 is 753042124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274200481 + 147039876 = 16559^2 + 12126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421240357 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 (421240327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210620178 + 210620179.

It is an arithmetic number, because the mean of its divisors is an integer number (210620179).

Almost surely, 2^421240357 is an apocalyptic number.

It is an amenable number.

421240357 is a deficient number, since it is larger than the sum of its proper divisors (1).

421240357 is an equidigital number, since it uses as much as digits as its factorization.

421240357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 421240357 is about 20524.1408346367. The cubic root of 421240357 is about 749.6237265152.

The spelling of 421240357 in words is "four hundred twenty-one million, two hundred forty thousand, three hundred fifty-seven".