421501231 has 2 divisors, whose sum is σ = 421501232. Its totient is φ = 421501230.

The previous prime is 421501219. The next prime is 421501253. The reversal of 421501231 is 132105124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421501231 - 2²⁵ = 387946799 is a prime.

It is a super-2 number, since 2×421501231² = 355326575469030722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421501199 and 421501208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421501291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210750615 + 210750616.

It is an arithmetic number, because the mean of its divisors is an integer number (210750616).

Almost surely, 2^421501231 is an apocalyptic number.

421501231 is a deficient number, since it is larger than the sum of its proper divisors (1).

421501231 is an equidigital number, since it uses as much as digits as its factorization.

421501231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 421501231 is about 20530.4951474630. The cubic root of 421501231 is about 749.7784418150.

Adding to 421501231 its reverse (132105124), we get a palindrome (553606355).

The spelling of 421501231 in words is "four hundred twenty-one million, five hundred one thousand, two hundred thirty-one".