21082446 has 144 divisors (see below), whose sum is σ = 60501168. Its totient is φ = 5241600.

The previous prime is 21082423. The next prime is 21082447. The reversal of 21082446 is 64428012.

21082446 is a `hidden beast` number, since 210 + 8 + 2 + 446 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082447) 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 71 ways as a sum of consecutive naturals, for example, 397756 + ... + 397808.

It is an arithmetic number, because the mean of its divisors is an integer number (420147).

Almost surely, 2^21082446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21082446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30250584).

21082446 is an abundant number, since it is smaller than the sum of its proper divisors (39418722).

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

21082446 is a wasteful number, since it uses less digits than its factorization.

21082446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 21082446 is about 4591.5624791567. The cubic root of 21082446 is about 276.2529973809.

It can be divided in two parts, 21082 and 446, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21082446 in words is "twenty-one million, eighty-two thousand, four hundred forty-six".