421212413 has 4 divisors (see below), whose sum is σ = 421721340. Its totient is φ = 420703488.

The previous prime is 421212401. The next prime is 421212419. The reversal of 421212413 is 314212124.

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 148401124 + 272811289 = 12182^2 + 16517^2 .

It is a cyclic number.

It is not a de Polignac number, because 421212413 - 2¹⁶ = 421146877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421212419) 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, 253220 + ... + 254877.

It is an arithmetic number, because the mean of its divisors is an integer number (105430335).

Almost surely, 2^421212413 is an apocalyptic number.

It is an amenable number.

421212413 is a deficient number, since it is larger than the sum of its proper divisors (508927).

421212413 is an equidigital number, since it uses as much as digits as its factorization.

421212413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508926.

The product of its digits is 384, while the sum is 20.

The square root of 421212413 is about 20523.4600640340. The cubic root of 421212413 is about 749.6071501131.

Adding to 421212413 its reverse (314212124), we get a palindrome (735424537).

The spelling of 421212413 in words is "four hundred twenty-one million, two hundred twelve thousand, four hundred thirteen".