21212110222102 has 4 divisors (see below), whose sum is σ = 31818165333156. Its totient is φ = 10606055111050.

The previous prime is 21212110222033. The next prime is 21212110222117. The reversal of 21212110222102 is 20122201121212.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×21212110222102³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21212110222102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303027555524 + ... + 5303027555527.

It is an arithmetic number, because the mean of its divisors is an integer number (7954541333289).

Almost surely, 2^{21212110222102} is an apocalyptic number.

21212110222102 is a deficient number, since it is larger than the sum of its proper divisors (10606055111054).

21212110222102 is a wasteful number, since it uses less digits than its factorization.

21212110222102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606055111053.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21212110222102 its reverse (20122201121212), we get a palindrome (41334311343314).

The spelling of 21212110222102 in words is "twenty-one trillion, two hundred twelve billion, one hundred ten million, two hundred twenty-two thousand, one hundred two".