21100212002 has 16 divisors (see below), whose sum is σ = 31928715000. Its totient is φ = 10457536128.

The previous prime is 21100211933. The next prime is 21100212059. The reversal of 21100212002 is 20021200112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20405836801 + 694375201 = 142849^2 + 26351^2 .

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 7 ways as a sum of consecutive naturals, for example, 128624 + ... + 242372.

Almost surely, 2^21100212002 is an apocalyptic number.

21100212002 is a deficient number, since it is larger than the sum of its proper divisors (10828502998).

21100212002 is a wasteful number, since it uses less digits than its factorization.

21100212002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114565.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100212002 its reverse (20021200112), we get a palindrome (41121412114).

The spelling of 21100212002 in words is "twenty-one billion, one hundred million, two hundred twelve thousand, two".