21211203202 has 24 divisors (see below), whose sum is σ = 37073900556. Its totient is φ = 9075161088.

The previous prime is 21211203199. The next prime is 21211203217. The reversal of 21211203202 is 20230211212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20900774041 + 310429161 = 144571^2 + 17619^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124383 + ... + 240610.

Almost surely, 2^21211203202 is an apocalyptic number.

21211203202 is a deficient number, since it is larger than the sum of its proper divisors (15862697354).

21211203202 is a wasteful number, since it uses less digits than its factorization.

21211203202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365602 (or 365595 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21211203202 its reverse (20230211212), we get a palindrome (41441414414).

The spelling of 21211203202 in words is "twenty-one billion, two hundred eleven million, two hundred three thousand, two hundred two".