21202102 has 4 divisors (see below), whose sum is σ = 31803156. Its totient is φ = 10601050.

The previous prime is 21202079. The next prime is 21202121. The reversal of 21202102 is 20120212.

It is a semiprime because it is the product of two 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 as a sum of consecutive naturals, namely, 5300524 + ... + 5300527.

It is an arithmetic number, because the mean of its divisors is an integer number (7950789).

Almost surely, 2^21202102 is an apocalyptic number.

21202102 is a deficient number, since it is larger than the sum of its proper divisors (10601054).

21202102 is a wasteful number, since it uses less digits than its factorization.

21202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601053.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21202102 is about 4604.5740302443. The cubic root of 21202102 is about 276.7746476134.

Adding to 21202102 its reverse (20120212), we get a palindrome (41322314).

It can be divided in two parts, 2120210 and 2, that added together give a palindrome (2120212).

The spelling of 21202102 in words is "twenty-one million, two hundred two thousand, one hundred two".