21002220202202 has 4 divisors (see below), whose sum is σ = 31503330303306. Its totient is φ = 10501110101100.

The previous prime is 21002220202111. The next prime is 21002220202247. The reversal of 21002220202202 is 20220202220012.

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., 20769521054881 + 232699147321 = 4557359^2 + 482389^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250555050549 + ... + 5250555050552.

Almost surely, 2^{21002220202202} is an apocalyptic number.

21002220202202 is a deficient number, since it is larger than the sum of its proper divisors (10501110101104).

21002220202202 is a wasteful number, since it uses less digits than its factorization.

21002220202202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10501110101103.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21002220202202 its reverse (20220202220012), we get a palindrome (41222422422214).

The spelling of 21002220202202 in words is "twenty-one trillion, two billion, two hundred twenty million, two hundred two thousand, two hundred two".