21220221022102 has 4 divisors (see below), whose sum is σ = 31830331533156. Its totient is φ = 10610110511050.

The previous prime is 21220221022081. The next prime is 21220221022109. The reversal of 21220221022102 is 20122012202212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21220221022102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220221022109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305055255524 + ... + 5305055255527.

It is an arithmetic number, because the mean of its divisors is an integer number (7957582883289).

Almost surely, 2^{21220221022102} is an apocalyptic number.

21220221022102 is a deficient number, since it is larger than the sum of its proper divisors (10610110511054).

21220221022102 is a wasteful number, since it uses less digits than its factorization.

21220221022102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610110511053.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21220221022102 its reverse (20122012202212), we get a palindrome (41342233224314).

The spelling of 21220221022102 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, twenty-two thousand, one hundred two".