21202102111010 has 16 divisors (see below), whose sum is σ = 38163856172472. Its totient is φ = 8480824761600.

The previous prime is 21202102111007. The next prime is 21202102111019. The reversal of 21202102111010 is 1011120120212.

It can be written as a sum of positive squares in 4 ways, for example, as 8549945592841 + 12652156518169 = 2924029^2 + 3556987^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21202102111019) 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, 4544180 + ... + 7940640.

Almost surely, 2^{21202102111010} is an apocalyptic number.

21202102111010 is a deficient number, since it is larger than the sum of its proper divisors (16961754061462).

21202102111010 is a wasteful number, since it uses less digits than its factorization.

21202102111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020709.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21202102111010 its reverse (1011120120212), we get a palindrome (22213222231222).

The spelling of 21202102111010 in words is "twenty-one trillion, two hundred two billion, one hundred two million, one hundred eleven thousand, ten".