21221102220202 has 16 divisors (see below), whose sum is σ = 32067846318600. Its totient is φ = 10532065001472.

The previous prime is 21221102220193. The next prime is 21221102220209. The reversal of 21221102220202 is 20202220112212.

It can be written as a sum of positive squares in 4 ways, for example, as 17469632949561 + 3751469270641 = 4179669^2 + 1936871^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21221102220202.

It is not an unprimeable number, because it can be changed into a prime (21221102220209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61048233 + ... + 61394860.

Almost surely, 2^{21221102220202} is an apocalyptic number.

21221102220202 is a deficient number, since it is larger than the sum of its proper divisors (10846744098398).

21221102220202 is a wasteful number, since it uses less digits than its factorization.

21221102220202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122443737.

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

Adding to 21221102220202 its reverse (20202220112212), we get a palindrome (41423322332414).

The spelling of 21221102220202 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty thousand, two hundred two".