21113420 has 12 divisors (see below), whose sum is σ = 44338224. Its totient is φ = 8445360.

The previous prime is 21113399. The next prime is 21113423. The reversal of 21113420 is 2431112.

It is a junction number, because it is equal to n+sod(n) for n = 21113395 and 21113404.

It is not an unprimeable number, because it can be changed into a prime (21113423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527816 + ... + 527855.

It is an arithmetic number, because the mean of its divisors is an integer number (3694852).

Almost surely, 2^21113420 is an apocalyptic number.

21113420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113420 is an abundant number, since it is smaller than the sum of its proper divisors (23224804).

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

21113420 is a wasteful number, since it uses less digits than its factorization.

21113420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055680 (or 1055678 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21113420 is about 4594.9341671019. The cubic root of 21113420 is about 276.3882200415.

Adding to 21113420 its reverse (2431112), we get a palindrome (23544532).

It can be divided in two parts, 211 and 13420, that added together give a palindrome (13631).

The spelling of 21113420 in words is "twenty-one million, one hundred thirteen thousand, four hundred twenty".