21010100210 has 16 divisors (see below), whose sum is σ = 41256196992. Its totient is φ = 7640036400.

The previous prime is 21010100203. The next prime is 21010100219. The reversal of 21010100210 is 1200101012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21010100219) by changing a digit.

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, 95500346 + ... + 95500565.

It is an arithmetic number, because the mean of its divisors is an integer number (2578512312).

Almost surely, 2^21010100210 is an apocalyptic number.

21010100210 is a deficient number, since it is larger than the sum of its proper divisors (20246096782).

21010100210 is a wasteful number, since it uses less digits than its factorization.

21010100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191000929.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21010100210 its reverse (1200101012), we get a palindrome (22210201222).

It can be divided in two parts, 210101002 and 10, that added together give a palindrome (210101012).

The spelling of 21010100210 in words is "twenty-one billion, ten million, one hundred thousand, two hundred ten".