21020200210102 has 16 divisors (see below), whose sum is σ = 32129026993440. Its totient is φ = 10310571648832.

The previous prime is 21020200210091. The next prime is 21020200210127. The reversal of 21020200210102 is 20101200202012.

It is a happy number.

It is a congruent number.

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, 10878727 + ... + 12664402.

It is an arithmetic number, because the mean of its divisors is an integer number (2008064187090).

Almost surely, 2^{21020200210102} is an apocalyptic number.

21020200210102 is a deficient number, since it is larger than the sum of its proper divisors (11108826783338).

21020200210102 is a wasteful number, since it uses less digits than its factorization.

21020200210102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23551607.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21020200210102 its reverse (20101200202012), we get a palindrome (41121400412114).

The spelling of 21020200210102 in words is "twenty-one trillion, twenty billion, two hundred million, two hundred ten thousand, one hundred two".