21222210021202 has 4 divisors (see below), whose sum is σ = 31833315031806. Its totient is φ = 10611105010600.

The previous prime is 21222210021193. The next prime is 21222210021217. The reversal of 21222210021202 is 20212001222212.

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., 19613729130121 + 1608480891081 = 4428739^2 + 1268259^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21222210021202.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305552505299 + ... + 5305552505302.

Almost surely, 2^{21222210021202} is an apocalyptic number.

21222210021202 is a deficient number, since it is larger than the sum of its proper divisors (10611105010604).

21222210021202 is a wasteful number, since it uses less digits than its factorization.

21222210021202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611105010603.

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

Adding to 21222210021202 its reverse (20212001222212), we get a palindrome (41434211243414).

The spelling of 21222210021202 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, twenty-one thousand, two hundred two".