21101100202 has 24 divisors (see below), whose sum is σ = 39651520356. Its totient is φ = 8347687488.

The previous prime is 21101100193. The next prime is 21101100227. The reversal of 21101100202 is 20200110112.

It can be written as a sum of positive squares in 2 ways, for example, as 21050817921 + 50282281 = 145089^2 + 7091^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8280163 + ... + 8282710.

Almost surely, 2^21101100202 is an apocalyptic number.

21101100202 is a deficient number, since it is larger than the sum of its proper divisors (18550420154).

21101100202 is a wasteful number, since it uses less digits than its factorization.

21101100202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16562902 (or 16562895 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101100202 its reverse (20200110112), we get a palindrome (41301210314).

The spelling of 21101100202 in words is "twenty-one billion, one hundred one million, one hundred thousand, two hundred two".