21202100210 has 16 divisors (see below), whose sum is σ = 38237040792. Its totient is φ = 8464560000.

The previous prime is 21202100207. The next prime is 21202100267. The reversal of 21202100210 is 1200120212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7899476641 + 13302623569 = 88879^2 + 115337^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21202100191 and 21202100200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2029541 + ... + 2039960.

Almost surely, 2^21202100210 is an apocalyptic number.

21202100210 is a deficient number, since it is larger than the sum of its proper divisors (17034940582).

21202100210 is a wasteful number, since it uses less digits than its factorization.

21202100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070029.

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

Adding to 21202100210 its reverse (1200120212), we get a palindrome (22402220422).

The spelling of 21202100210 in words is "twenty-one billion, two hundred two million, one hundred thousand, two hundred ten".