21102220102 has 16 divisors (see below), whose sum is σ = 31897387872. Its totient is φ = 10469908800.

The previous prime is 21102220091. The next prime is 21102220151. The reversal of 21102220102 is 20102220112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245688 + ... + 320260.

It is an arithmetic number, because the mean of its divisors is an integer number (1993586742).

Almost surely, 2^21102220102 is an apocalyptic number.

21102220102 is a deficient number, since it is larger than the sum of its proper divisors (10795167770).

21102220102 is a wasteful number, since it uses less digits than its factorization.

21102220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75663.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21102220102 its reverse (20102220112), we get a palindrome (41204440214).

The spelling of 21102220102 in words is "twenty-one billion, one hundred two million, two hundred twenty thousand, one hundred two".