21210102111 has 64 divisors (see below), whose sum is σ = 32162489856. Its totient is φ = 12320064000.

The previous prime is 21210102107. The next prime is 21210102113. The reversal of 21210102111 is 11120101212.

It is not a de Polignac number, because 21210102111 - 2² = 21210102107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210102113) 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 63 ways as a sum of consecutive naturals, for example, 36132760 + ... + 36133346.

It is an arithmetic number, because the mean of its divisors is an integer number (502538904).

Almost surely, 2^21210102111 is an apocalyptic number.

21210102111 is a deficient number, since it is larger than the sum of its proper divisors (10952387745).

21210102111 is a wasteful number, since it uses less digits than its factorization.

21210102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210102111 its reverse (11120101212), we get a palindrome (32330203323).

It can be divided in two parts, 21210 and 102111, that added together give a palindrome (123321).

The spelling of 21210102111 in words is "twenty-one billion, two hundred ten million, one hundred two thousand, one hundred eleven".