21001200210102 has 64 divisors (see below), whose sum is σ = 48036372655104. Its totient is φ = 5996140698240.

The previous prime is 21001200210079. The next prime is 21001200210163. The reversal of 21001200210102 is 20101200210012.

It is a super-3 number, since 3×21001200210102³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 389482848 + ... + 389536764.

It is an arithmetic number, because the mean of its divisors is an integer number (750568322736).

Almost surely, 2^{21001200210102} is an apocalyptic number.

21001200210102 is an abundant number, since it is smaller than the sum of its proper divisors (27035172445002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001200210102 is a wasteful number, since it uses less digits than its factorization.

21001200210102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60253.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21001200210102 its reverse (20101200210012), we get a palindrome (41102400420114).

The spelling of 21001200210102 in words is "twenty-one trillion, one billion, two hundred million, two hundred ten thousand, one hundred two".