21002201212210 has 16 divisors (see below), whose sum is σ = 37804241347992. Its totient is φ = 8400818448000.

The previous prime is 21002201212171. The next prime is 21002201212219. The reversal of 21002201212210 is 1221210220012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14849177092369 + 6153024119841 = 3853463^2 + 2480529^2 .

It is not an unprimeable number, because it can be changed into a prime (21002201212219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6320091 + ... + 9052510.

Almost surely, 2^{21002201212210} is an apocalyptic number.

21002201212210 is a deficient number, since it is larger than the sum of its proper divisors (16802040135782).

21002201212210 is a wasteful number, since it uses less digits than its factorization.

21002201212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15509229.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002201212210 its reverse (1221210220012), we get a palindrome (22223411432222).

The spelling of 21002201212210 in words is "twenty-one trillion, two billion, two hundred one million, two hundred twelve thousand, two hundred ten".