421355507 has 4 divisors (see below), whose sum is σ = 422570136. Its totient is φ = 420140880.

The previous prime is 421355479. The next prime is 421355509. The reversal of 421355507 is 705553124.

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

It is a cyclic number.

It is not a de Polignac number, because 421355507 - 2²⁸ = 152920051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421355509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606794 + ... + 607487.

It is an arithmetic number, because the mean of its divisors is an integer number (105642534).

Almost surely, 2^421355507 is an apocalyptic number.

421355507 is a deficient number, since it is larger than the sum of its proper divisors (1214629).

421355507 is a wasteful number, since it uses less digits than its factorization.

421355507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214628.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 421355507 is about 20526.9458760917. The cubic root of 421355507 is about 749.6920258495.

The spelling of 421355507 in words is "four hundred twenty-one million, three hundred fifty-five thousand, five hundred seven".