21222202202 has 4 divisors (see below), whose sum is σ = 31833303306. Its totient is φ = 10611101100.

The previous prime is 21222202193. The next prime is 21222202207. The reversal of 21222202202 is 20220222212.

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., 14696955361 + 6525246841 = 121231^2 + 80779^2 .

It is not an unprimeable number, because it can be changed into a prime (21222202207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305550549 + ... + 5305550552.

Almost surely, 2^21222202202 is an apocalyptic number.

21222202202 is a deficient number, since it is larger than the sum of its proper divisors (10611101104).

21222202202 is a wasteful number, since it uses less digits than its factorization.

21222202202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611101103.

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

Adding to 21222202202 its reverse (20220222212), we get a palindrome (41442424414).

The spelling of 21222202202 in words is "twenty-one billion, two hundred twenty-two million, two hundred two thousand, two hundred two".