21201122222102 has 4 divisors (see below), whose sum is σ = 31801683333156. Its totient is φ = 10600561111050.

The previous prime is 21201122222101. The next prime is 21201122222143. The reversal of 21201122222102 is 20122222110212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201122222101) by changing a digit.

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 as a sum of consecutive naturals, namely, 5300280555524 + ... + 5300280555527.

It is an arithmetic number, because the mean of its divisors is an integer number (7950420833289).

Almost surely, 2^{21201122222102} is an apocalyptic number.

21201122222102 is a deficient number, since it is larger than the sum of its proper divisors (10600561111054).

21201122222102 is a wasteful number, since it uses less digits than its factorization.

21201122222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10600561111053.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21201122222102 its reverse (20122222110212), we get a palindrome (41323344332314).

The spelling of 21201122222102 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred two".