421003145 has 4 divisors (see below), whose sum is σ = 505203780. Its totient is φ = 336802512.

The previous prime is 421003139. The next prime is 421003169. The reversal of 421003145 is 541300124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101022601 + 319980544 = 10051^2 + 17888^2 .

It is a cyclic number.

It is not a de Polignac number, because 421003145 - 2⁶ = 421003081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42100310 + ... + 42100319.

It is an arithmetic number, because the mean of its divisors is an integer number (126300945).

Almost surely, 2^421003145 is an apocalyptic number.

It is an amenable number.

421003145 is a deficient number, since it is larger than the sum of its proper divisors (84200635).

421003145 is an equidigital number, since it uses as much as digits as its factorization.

421003145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84200634.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 421003145 is about 20518.3611675007. The cubic root of 421003145 is about 749.4829888664.

Adding to 421003145 its reverse (541300124), we get a palindrome (962303269).

The spelling of 421003145 in words is "four hundred twenty-one million, three thousand, one hundred forty-five".