21111046 has 16 divisors (see below), whose sum is σ = 34645968. Its totient is φ = 9568000.

The previous prime is 21111029. The next prime is 21111049. The reversal of 21111046 is 64011112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7626 + ... + 10018.

It is an arithmetic number, because the mean of its divisors is an integer number (2165373).

Almost surely, 2^21111046 is an apocalyptic number.

21111046 is a deficient number, since it is larger than the sum of its proper divisors (13534922).

21111046 is a wasteful number, since it uses less digits than its factorization.

21111046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 21111046 is about 4594.6758318732. The cubic root of 21111046 is about 276.3778605919.

Adding to 21111046 its reverse (64011112), we get a palindrome (85122158).

The spelling of 21111046 in words is "twenty-one million, one hundred eleven thousand, forty-six".