21214120 has 16 divisors (see below), whose sum is σ = 47731860. Its totient is φ = 8485632.

The previous prime is 21214117. The next prime is 21214133. The reversal of 21214120 is 2141212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20958084 + 256036 = 4578^2 + 506^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21214120.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265137 + ... + 265216.

Almost surely, 2^21214120 is an apocalyptic number.

21214120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214120 is an abundant number, since it is smaller than the sum of its proper divisors (26517740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21214120 is a wasteful number, since it uses less digits than its factorization.

21214120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530364 (or 530360 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21214120 is about 4605.8788520759. The cubic root of 21214120 is about 276.8269325148.

Adding to 21214120 its reverse (2141212), we get a palindrome (23355332).

It can be divided in two parts, 2121 and 4120, that added together give a square (6241 = 79²).

The spelling of 21214120 in words is "twenty-one million, two hundred fourteen thousand, one hundred twenty".