21222102122002 has 4 divisors (see below), whose sum is σ = 31833153183006. Its totient is φ = 10611051061000.

The previous prime is 21222102121949. The next prime is 21222102122057. The reversal of 21222102122002 is 20022120122212.

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

It can be written as a sum of positive squares in only one way, i.e., 19035166910761 + 2186935211241 = 4362931^2 + 1478829^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305525530499 + ... + 5305525530502.

Almost surely, 2^{21222102122002} is an apocalyptic number.

21222102122002 is a deficient number, since it is larger than the sum of its proper divisors (10611051061004).

21222102122002 is a wasteful number, since it uses less digits than its factorization.

21222102122002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611051061003.

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

Adding to 21222102122002 its reverse (20022120122212), we get a palindrome (41244222244214).

The spelling of 21222102122002 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred two million, one hundred twenty-two thousand, two".