21010111102 has 32 divisors (see below), whose sum is σ = 32494556160. Its totient is φ = 10184359200.

The previous prime is 21010111091. The next prime is 21010111103. The reversal of 21010111102 is 20111101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010111103) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3131083 + ... + 3137785.

It is an arithmetic number, because the mean of its divisors is an integer number (1015454880).

Almost surely, 2^21010111102 is an apocalyptic number.

21010111102 is a deficient number, since it is larger than the sum of its proper divisors (11484445058).

21010111102 is a wasteful number, since it uses less digits than its factorization.

21010111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7128.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21010111102 its reverse (20111101012), we get a palindrome (41121212114).

The spelling of 21010111102 in words is "twenty-one billion, ten million, one hundred eleven thousand, one hundred two".