21064120 has 96 divisors (see below), whose sum is σ = 60205680. Its totient is φ = 6558720.

The previous prime is 21064117. The next prime is 21064133. The reversal of 21064120 is 2146012.

It is a junction number, because it is equal to n+sod(n) for n = 21064094 and 21064103.

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 23 ways as a sum of consecutive naturals, for example, 21072 + ... + 22048.

Almost surely, 2^21064120 is an apocalyptic number.

21064120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21064120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30102840).

21064120 is an abundant number, since it is smaller than the sum of its proper divisors (39141560).

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

21064120 is a wasteful number, since it uses less digits than its factorization.

21064120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 1002 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21064120 is about 4589.5664283241. The cubic root of 21064120 is about 276.1729295045.

It can be divided in two parts, 2106 and 4120, that added together give a palindrome (6226).

The spelling of 21064120 in words is "twenty-one million, sixty-four thousand, one hundred twenty".