21211210222102 has 4 divisors (see below), whose sum is σ = 31816815333156. Its totient is φ = 10605605111050.

The previous prime is 21211210222093. The next prime is 21211210222123. The reversal of 21211210222102 is 20122201211212.

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

It is a super-3 number, since 3×21211210222102³ (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 21211210222102.

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, 5302802555524 + ... + 5302802555527.

It is an arithmetic number, because the mean of its divisors is an integer number (7954203833289).

Almost surely, 2^{21211210222102} is an apocalyptic number.

21211210222102 is a deficient number, since it is larger than the sum of its proper divisors (10605605111054).

21211210222102 is a wasteful number, since it uses less digits than its factorization.

21211210222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605605111053.

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

Adding to 21211210222102 its reverse (20122201211212), we get a palindrome (41333411433314).

The spelling of 21211210222102 in words is "twenty-one trillion, two hundred eleven billion, two hundred ten million, two hundred twenty-two thousand, one hundred two".