421470557 has 2 divisors, whose sum is σ = 421470558. Its totient is φ = 421470556.

The previous prime is 421470547. The next prime is 421470619. The reversal of 421470557 is 755074124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420004036 + 1466521 = 20494^2 + 1211^2 .

It is a cyclic number.

It is not a de Polignac number, because 421470557 - 2⁶ = 421470493 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 (421470527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210735278 + 210735279.

It is an arithmetic number, because the mean of its divisors is an integer number (210735279).

Almost surely, 2^421470557 is an apocalyptic number.

It is an amenable number.

421470557 is a deficient number, since it is larger than the sum of its proper divisors (1).

421470557 is an equidigital number, since it uses as much as digits as its factorization.

421470557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39200, while the sum is 35.

The square root of 421470557 is about 20529.7480987956. The cubic root of 421470557 is about 749.7602534444.

The spelling of 421470557 in words is "four hundred twenty-one million, four hundred seventy thousand, five hundred fifty-seven".