21414256 has 10 divisors (see below), whose sum is σ = 41490152. Its totient is φ = 10707120.

The previous prime is 21414241. The next prime is 21414257. The reversal of 21414256 is 65241412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21414256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669180 + ... + 669211.

Almost surely, 2^21414256 is an apocalyptic number.

It is an amenable number.

21414256 is a deficient number, since it is larger than the sum of its proper divisors (20075896).

21414256 is a wasteful number, since it uses less digits than its factorization.

21414256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338399 (or 1338393 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 21414256 is about 4627.5539975240. The cubic root of 21414256 is about 277.6947462884.

Adding to 21414256 its reverse (65241412), we get a palindrome (86655668).

The spelling of 21414256 in words is "twenty-one million, four hundred fourteen thousand, two hundred fifty-six".