21001111122202 has 4 divisors (see below), whose sum is σ = 31501666683306. Its totient is φ = 10500555561100.

The previous prime is 21001111122179. The next prime is 21001111122223. The reversal of 21001111122202 is 20222111110012.

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., 20684658745521 + 316452376681 = 4548039^2 + 562541^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250277780549 + ... + 5250277780552.

Almost surely, 2^{21001111122202} is an apocalyptic number.

21001111122202 is a deficient number, since it is larger than the sum of its proper divisors (10500555561104).

21001111122202 is a wasteful number, since it uses less digits than its factorization.

21001111122202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500555561103.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21001111122202 its reverse (20222111110012), we get a palindrome (41223222232214).

The spelling of 21001111122202 in words is "twenty-one trillion, one billion, one hundred eleven million, one hundred twenty-two thousand, two hundred two".