21211111202 has 8 divisors (see below), whose sum is σ = 32131683612. Its totient is φ = 10500550000.

The previous prime is 21211111147. The next prime is 21211111253. The reversal of 21211111202 is 20211111212.

It can be written as a sum of positive squares in 2 ways, for example, as 20834324281 + 376786921 = 144341^2 + 19411^2 .

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

It is a super-2 number, since 2×21211111202² (a number of 21 digits) contains 22 as substring.

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, 52502549 + ... + 52502952.

Almost surely, 2^21211111202 is an apocalyptic number.

21211111202 is a deficient number, since it is larger than the sum of its proper divisors (10920572410).

21211111202 is a wasteful number, since it uses less digits than its factorization.

21211111202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105005604.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21211111202 its reverse (20211111212), we get a palindrome (41422222414).

The spelling of 21211111202 in words is "twenty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred two".