21211111212110 has 16 divisors (see below), whose sum is σ = 38181240225936. Its totient is φ = 8484168919488.

The previous prime is 21211111212107. The next prime is 21211111212133. The reversal of 21211111212110 is 1121211111212.

It is a super-2 number, since 2×21211111212110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 34122239 + ... + 34738298.

It is an arithmetic number, because the mean of its divisors is an integer number (2386327514121).

Almost surely, 2^{21211111212110} is an apocalyptic number.

21211111212110 is a deficient number, since it is larger than the sum of its proper divisors (16970129013826).

21211111212110 is a wasteful number, since it uses less digits than its factorization.

21211111212110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68891347.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 21211111212110 its reverse (1121211111212), we get a palindrome (22332322323322).

The spelling of 21211111212110 in words is "twenty-one trillion, two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred ten".