21243214 has 16 divisors (see below), whose sum is σ = 33351552. Its totient is φ = 10128888.

The previous prime is 21243193. The next prime is 21243227. The reversal of 21243214 is 41234212.

It is a junction number, because it is equal to n+sod(n) for n = 21243191 and 21243200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23617 + ... + 24499.

It is an arithmetic number, because the mean of its divisors is an integer number (2084472).

Almost surely, 2^21243214 is an apocalyptic number.

21243214 is a deficient number, since it is larger than the sum of its proper divisors (12108338).

21243214 is a wasteful number, since it uses less digits than its factorization.

21243214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431.

The product of its digits is 384, while the sum is 19.

The square root of 21243214 is about 4609.0361248313. The cubic root of 21243214 is about 276.9534256823.

Adding to 21243214 its reverse (41234212), we get a palindrome (62477426).

The spelling of 21243214 in words is "twenty-one million, two hundred forty-three thousand, two hundred fourteen".