421312261 has 8 divisors (see below), whose sum is σ = 436231800. Its totient is φ = 406418880.

The previous prime is 421312259. The next prime is 421312267. The reversal of 421312261 is 162213124.

It can be written as a sum of positive squares in 4 ways, for example, as 110460100 + 310852161 = 10510^2 + 17631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421312261 - 2¹ = 421312259 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 (421312267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29731 + ... + 41551.

It is an arithmetic number, because the mean of its divisors is an integer number (54528975).

Almost surely, 2^421312261 is an apocalyptic number.

It is an amenable number.

421312261 is a deficient number, since it is larger than the sum of its proper divisors (14919539).

421312261 is a wasteful number, since it uses less digits than its factorization.

421312261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13079.

The product of its digits is 576, while the sum is 22.

The square root of 421312261 is about 20525.8924531919. The cubic root of 421312261 is about 749.6663766530. Note that the first 3 decimals are identical.

Adding to 421312261 its reverse (162213124), we get a palindrome (583525385).

The spelling of 421312261 in words is "four hundred twenty-one million, three hundred twelve thousand, two hundred sixty-one".