21412214 has 16 divisors (see below), whose sum is σ = 34477488. Its totient is φ = 9937152.

The previous prime is 21412189. The next prime is 21412217. The reversal of 21412214 is 41221412.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 21412192 and 21412201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412217) 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, 1832 + ... + 6795.

It is an arithmetic number, because the mean of its divisors is an integer number (2154843).

Almost surely, 2^21412214 is an apocalyptic number.

21412214 is a deficient number, since it is larger than the sum of its proper divisors (13065274).

21412214 is a wasteful number, since it uses less digits than its factorization.

21412214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8719.

The product of its digits is 128, while the sum is 17.

The square root of 21412214 is about 4627.3333573452. Note that the first 4 decimals coincide. The cubic root of 21412214 is about 277.6859192918.

Adding to 21412214 its reverse (41221412), we get a palindrome (62633626).

The spelling of 21412214 in words is "twenty-one million, four hundred twelve thousand, two hundred fourteen".