21211102 has 16 divisors (see below), whose sum is σ = 34780032. Its totient is φ = 9621720.

The previous prime is 21211079. The next prime is 21211109. The reversal of 21211102 is 20111212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19423 + ... + 20485.

It is an arithmetic number, because the mean of its divisors is an integer number (2173752).

Almost surely, 2^21211102 is an apocalyptic number.

21211102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21211102 is a deficient number, since it is larger than the sum of its proper divisors (13568930).

21211102 is a wasteful number, since it uses less digits than its factorization.

21211102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21211102 is about 4605.5512156527. The cubic root of 21211102 is about 276.8138044142.

Adding to 21211102 its reverse (20111212), we get a palindrome (41322314).

It can be divided in two parts, 2121 and 1102, that added together give a palindrome (3223).

The spelling of 21211102 in words is "twenty-one million, two hundred eleven thousand, one hundred two".