21220065102 has 8 divisors (see below), whose sum is σ = 42440130216. Its totient is φ = 7073355032.

The previous prime is 21220065077. The next prime is 21220065133. The reversal of 21220065102 is 20156002212.

It is a happy number.

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

21220065102 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768338753 + ... + 1768338764.

It is an arithmetic number, because the mean of its divisors is an integer number (5305016277).

Almost surely, 2^21220065102 is an apocalyptic number.

21220065102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21220065102 is a wasteful number, since it uses less digits than its factorization.

21220065102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3536677522.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21220065102 its reverse (20156002212), we get a palindrome (41376067314).

The spelling of 21220065102 in words is "twenty-one billion, two hundred twenty million, sixty-five thousand, one hundred two".