21206102 has 8 divisors (see below), whose sum is σ = 32585112. Its totient is φ = 10344400.

The previous prime is 21206011. The next prime is 21206117. The reversal of 21206102 is 20160212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 129224 + ... + 129387.

It is an arithmetic number, because the mean of its divisors is an integer number (4073139).

Almost surely, 2^21206102 is an apocalyptic number.

21206102 is a deficient number, since it is larger than the sum of its proper divisors (11379010).

21206102 is a wasteful number, since it uses less digits than its factorization.

21206102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258654.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21206102 is about 4605.0083604702. The cubic root of 21206102 is about 276.7920520037.

Adding to 21206102 its reverse (20160212), we get a palindrome (41366314).

The spelling of 21206102 in words is "twenty-one million, two hundred six thousand, one hundred two".