421512005 has 16 divisors (see below), whose sum is σ = 513838080. Its totient is φ = 331888128.

The previous prime is 421511999. The next prime is 421512011. The reversal of 421512005 is 500215124.

It is an interprime number because it is at equal distance from previous prime (421511999) and next prime (421512011).

It is a cyclic number.

It is not a de Polignac number, because 421512005 - 2⁸ = 421511749 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137924 + ... + 140946.

It is an arithmetic number, because the mean of its divisors is an integer number (32114880).

Almost surely, 2^421512005 is an apocalyptic number.

It is an amenable number.

421512005 is a deficient number, since it is larger than the sum of its proper divisors (92326075).

421512005 is a wasteful number, since it uses less digits than its factorization.

421512005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3460.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 421512005 is about 20530.7575359508. The cubic root of 421512005 is about 749.7848301270.

Adding to 421512005 its reverse (500215124), we get a palindrome (921727129).

The spelling of 421512005 in words is "four hundred twenty-one million, five hundred twelve thousand, five".