21260120 has 48 divisors (see below), whose sum is σ = 55650240. Its totient is φ = 7288512.

The previous prime is 21260117. The next prime is 21260137. The reversal of 21260120 is 2106212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a zygodrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 21260095 and 21260104.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3464 + ... + 7383.

It is an arithmetic number, because the mean of its divisors is an integer number (1159380).

Almost surely, 2^21260120 is an apocalyptic number.

21260120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21260120 is an abundant number, since it is smaller than the sum of its proper divisors (34390120).

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

21260120 is a wasteful number, since it uses less digits than its factorization.

21260120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10872 (or 10861 counting only the distinct ones).

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

The square root of 21260120 is about 4610.8697661070. The cubic root of 21260120 is about 277.0268755393.

Adding to 21260120 its reverse (2106212), we get a palindrome (23366332).

The spelling of 21260120 in words is "twenty-one million, two hundred sixty thousand, one hundred twenty".