21211102202 has 4 divisors (see below), whose sum is σ = 31816653306. Its totient is φ = 10605551100.

The previous prime is 21211102141. The next prime is 21211102217. The reversal of 21211102202 is 20220111212.

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., 15229781281 + 5981320921 = 123409^2 + 77339^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302775549 + ... + 5302775552.

Almost surely, 2^21211102202 is an apocalyptic number.

21211102202 is a deficient number, since it is larger than the sum of its proper divisors (10605551104).

21211102202 is a wasteful number, since it uses less digits than its factorization.

21211102202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605551103.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21211102202 its reverse (20220111212), we get a palindrome (41431213414).

The spelling of 21211102202 in words is "twenty-one billion, two hundred eleven million, one hundred two thousand, two hundred two".