21042102 has 32 divisors (see below), whose sum is σ = 44997120. Its totient is φ = 6543680.

The previous prime is 21042097. The next prime is 21042103. The reversal of 21042102 is 20124012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042103) 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 15 ways as a sum of consecutive naturals, for example, 3799 + ... + 7517.

It is an arithmetic number, because the mean of its divisors is an integer number (1406160).

Almost surely, 2^21042102 is an apocalyptic number.

21042102 is an abundant number, since it is smaller than the sum of its proper divisors (23955018).

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

21042102 is a wasteful number, since it uses less digits than its factorization.

21042102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21042102 is about 4587.1670996379. The cubic root of 21042102 is about 276.0766695214.

Adding to 21042102 its reverse (20124012), we get a palindrome (41166114).

The spelling of 21042102 in words is "twenty-one million, forty-two thousand, one hundred two".