21001100212210 has 16 divisors (see below), whose sum is σ = 38055684951000. Its totient is φ = 8344061291776.

The previous prime is 21001100212207. The next prime is 21001100212229. The reversal of 21001100212210 is 1221200110012.

It can be written as a sum of positive squares in 4 ways, for example, as 17672077369489 + 3329022842721 = 4203817^2 + 1824561^2 .

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, 7047347575 + ... + 7047350554.

Almost surely, 2^{21001100212210} is an apocalyptic number.

21001100212210 is a deficient number, since it is larger than the sum of its proper divisors (17054584738790).

21001100212210 is a wasteful number, since it uses less digits than its factorization.

21001100212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14094698285.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001100212210 its reverse (1221200110012), we get a palindrome (22222300322222).

The spelling of 21001100212210 in words is "twenty-one trillion, one billion, one hundred million, two hundred twelve thousand, two hundred ten".