2213421 has 8 divisors (see below), whose sum is σ = 3372864. Its totient is φ = 1264800.

The previous prime is 2213413. The next prime is 2213423. The reversal of 2213421 is 1243122.

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

It is not a de Polignac number, because 2213421 - 2³ = 2213413 is a prime.

It is a Curzon number.

2213421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2213421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2213423) 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, 52680 + ... + 52721.

It is an arithmetic number, because the mean of its divisors is an integer number (421608).

2^2213421 is an apocalyptic number.

2213421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2213421 is a deficient number, since it is larger than the sum of its proper divisors (1159443).

2213421 is a wasteful number, since it uses less digits than its factorization.

2213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105411.

The product of its digits is 96, while the sum is 15.

The square root of 2213421 is about 1487.7570366159. The cubic root of 2213421 is about 130.3230819981.

Adding to 2213421 its reverse (1243122), we get a palindrome (3456543).

Subtracting from 2213421 its reverse (1243122), we obtain a cube (970299 = 99³).

It can be divided in two parts, 22134 and 21, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 2213421 in words is "two million, two hundred thirteen thousand, four hundred twenty-one".