264218421 has 4 divisors (see below), whose sum is σ = 352291232. Its totient is φ = 176145612.

The previous prime is 264218407. The next prime is 264218429. The reversal of 264218421 is 124812462.

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 not a de Polignac number, because 264218421 - 2¹⁷ = 264087349 is a prime.

It is a super-2 number, since 2×264218421² = 139622747991466482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264218429) 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, 44036401 + ... + 44036406.

It is an arithmetic number, because the mean of its divisors is an integer number (88072808).

Almost surely, 2^264218421 is an apocalyptic number.

It is an amenable number.

264218421 is a deficient number, since it is larger than the sum of its proper divisors (88072811).

264218421 is an equidigital number, since it uses as much as digits as its factorization.

264218421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88072810.

The product of its digits is 6144, while the sum is 30.

The square root of 264218421 is about 16254.7968612345. The cubic root of 264218421 is about 641.6837346184.

The spelling of 264218421 in words is "two hundred sixty-four million, two hundred eighteen thousand, four hundred twenty-one".