21001002002210 has 16 divisors (see below), whose sum is σ = 37801939404600. Its totient is φ = 8400370622976.

The previous prime is 21001002002209. The next prime is 21001002002231. The reversal of 21001002002210 is 1220020010012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20761427973841 + 239574028369 = 4556471^2 + 489463^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21001002002191 and 21001002002200.

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, 732815 + ... + 6522194.

Almost surely, 2^{21001002002210} is an apocalyptic number.

21001002002210 is a deficient number, since it is larger than the sum of its proper divisors (16800937402390).

21001002002210 is a wasteful number, since it uses less digits than its factorization.

21001002002210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7544485.

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

Adding to 21001002002210 its reverse (1220020010012), we get a palindrome (22221022012222).

The spelling of 21001002002210 in words is "twenty-one trillion, one billion, two million, two thousand, two hundred ten".