421513 has 4 divisors (see below), whose sum is σ = 424960. Its totient is φ = 418068.

The previous prime is 421501. The next prime is 421517. The reversal of 421513 is 315124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421513 - 2¹⁷ = 290441 is a prime.

It is a Duffinian number.

421513 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (421517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1533 + ... + 1786.

It is an arithmetic number, because the mean of its divisors is an integer number (106240).

2⁴²¹⁵¹³ is an apocalyptic number.

It is an amenable number.

421513 is a deficient number, since it is larger than the sum of its proper divisors (3447).

421513 is a wasteful number, since it uses less digits than its factorization.

421513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3446.

The product of its digits is 120, while the sum is 16.

The square root of 421513 is about 649.2403253034. The cubic root of 421513 is about 74.9785420095.

Adding to 421513 its reverse (315124), we get a palindrome (736637).

It can be divided in two parts, 42 and 1513, that multiplied together give a triangular number (63546 = T₃₅₆).

The spelling of 421513 in words is "four hundred twenty-one thousand, five hundred thirteen".