21041016 has 32 divisors (see below), whose sum is σ = 52790400. Its totient is φ = 6988640.

The previous prime is 21041011. The next prime is 21041029. The reversal of 21041016 is 61014012.

It is a junction number, because it is equal to n+sod(n) for n = 21040986 and 21041004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041011) 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, 6055 + ... + 8873.

It is an arithmetic number, because the mean of its divisors is an integer number (1649700).

Almost surely, 2^21041016 is an apocalyptic number.

It is an amenable number.

21041016 is an abundant number, since it is smaller than the sum of its proper divisors (31749384).

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

21041016 is a wasteful number, since it uses less digits than its factorization.

21041016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139 (or 3135 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21041016 is about 4587.0487243979. The cubic root of 21041016 is about 276.0719199259.

Adding to 21041016 its reverse (61014012), we get a palindrome (82055028).

The spelling of 21041016 in words is "twenty-one million, forty-one thousand, sixteen".