21114220 has 24 divisors (see below), whose sum is σ = 44427600. Its totient is φ = 8428992.

The previous prime is 21114217. The next prime is 21114229. The reversal of 21114220 is 2241112.

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 21114220.

It is not an unprimeable number, because it can be changed into a prime (21114229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16566 + ... + 17794.

It is an arithmetic number, because the mean of its divisors is an integer number (1851150).

Almost surely, 2^21114220 is an apocalyptic number.

21114220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21114220 is an abundant number, since it is smaller than the sum of its proper divisors (23313380).

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

21114220 is a wasteful number, since it uses less digits than its factorization.

21114220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097 (or 2095 counting only the distinct ones).

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

The square root of 21114220 is about 4595.0212186670. The cubic root of 21114220 is about 276.3917108352.

Adding to 21114220 its reverse (2241112), we get a palindrome (23355332).

The spelling of 21114220 in words is "twenty-one million, one hundred fourteen thousand, two hundred twenty".