21220110012202 has 4 divisors (see below), whose sum is σ = 31830165018306. Its totient is φ = 10610055006100.

The previous prime is 21220110012149. The next prime is 21220110012209. The reversal of 21220110012202 is 20221001102212.

It is a happy number.

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., 20440263830281 + 779846181921 = 4521091^2 + 883089^2 .

It is not an unprimeable number, because it can be changed into a prime (21220110012209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305027503049 + ... + 5305027503052.

Almost surely, 2^{21220110012202} is an apocalyptic number.

21220110012202 is a deficient number, since it is larger than the sum of its proper divisors (10610055006104).

21220110012202 is a wasteful number, since it uses less digits than its factorization.

21220110012202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610055006103.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220110012202 its reverse (20221001102212), we get a palindrome (41441111114414).

The spelling of 21220110012202 in words is "twenty-one trillion, two hundred twenty billion, one hundred ten million, twelve thousand, two hundred two".