21044012 has 12 divisors (see below), whose sum is σ = 40175016. Its totient is φ = 9565440.

The previous prime is 21044003. The next prime is 21044047.

21044012 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21044012² = 885700882112288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239093 + ... + 239180.

It is an arithmetic number, because the mean of its divisors is an integer number (3347918).

Almost surely, 2^21044012 is an apocalyptic number.

21044012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21044012 is a deficient number, since it is larger than the sum of its proper divisors (19131004).

21044012 is a wasteful number, since it uses less digits than its factorization.

21044012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478288 (or 478286 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21044012 is about 4587.3752844083. The cubic root of 21044012 is about 276.0850224652.

It can be divided in two parts, 2104 and 4012, that added together give a palindrome (6116).

The spelling of 21044012 in words is "twenty-one million, forty-four thousand, twelve".