21211122202 has 8 divisors (see below), whose sum is σ = 31820544756. Its totient is φ = 10604273952.

The previous prime is 21211122199. The next prime is 21211122227. The reversal of 21211122202 is 20222111212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16876348281 + 4334773921 = 129909^2 + 65839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622843 + ... + 656014.

Almost surely, 2^21211122202 is an apocalyptic number.

21211122202 is a deficient number, since it is larger than the sum of its proper divisors (10609422554).

21211122202 is a wasteful number, since it uses less digits than its factorization.

21211122202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287152.

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

Adding to 21211122202 its reverse (20222111212), we get a palindrome (41433233414).

The spelling of 21211122202 in words is "twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred two".