21220012102 has 8 divisors (see below), whose sum is σ = 33702372216. Its totient is φ = 9985888032.

The previous prime is 21220012097. The next prime is 21220012127. The reversal of 21220012102 is 20121002212.

It is a happy number.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312058968 + ... + 312059035.

It is an arithmetic number, because the mean of its divisors is an integer number (4212796527).

Almost surely, 2^21220012102 is an apocalyptic number.

21220012102 is a deficient number, since it is larger than the sum of its proper divisors (12482360114).

21220012102 is a wasteful number, since it uses less digits than its factorization.

21220012102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624118022.

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

Adding to 21220012102 its reverse (20121002212), we get a palindrome (41341014314).

The spelling of 21220012102 in words is "twenty-one billion, two hundred twenty million, twelve thousand, one hundred two".