21100002101210 has 16 divisors (see below), whose sum is σ = 37989700049736. Its totient is φ = 8437846114368.

The previous prime is 21100002101209. The next prime is 21100002101219. The reversal of 21100002101210 is 1210120000112.

It can be written as a sum of positive squares in 4 ways, for example, as 21095272375681 + 4729725529 = 4592959^2 + 68773^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21100002101191 and 21100002101200.

It is not an unprimeable number, because it can be changed into a prime (21100002101219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269299637 + ... + 269377976.

Almost surely, 2^{21100002101210} is an apocalyptic number.

21100002101210 is a deficient number, since it is larger than the sum of its proper divisors (16889697948526).

21100002101210 is a wasteful number, since it uses less digits than its factorization.

21100002101210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538681537.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21100002101210 its reverse (1210120000112), we get a palindrome (22310122101322).

The spelling of 21100002101210 in words is "twenty-one trillion, one hundred billion, two million, one hundred one thousand, two hundred ten".