21111110210 has 8 divisors (see below), whose sum is σ = 37999998396. Its totient is φ = 8444444080.

The previous prime is 21111110161. The next prime is 21111110231. The reversal of 21111110210 is 1201111112.

It can be written as a sum of positive squares in 2 ways, for example, as 20943588961 + 167521249 = 144719^2 + 12943^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21111110210³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111110191 and 21111110200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055555501 + ... + 1055555520.

Almost surely, 2^21111110210 is an apocalyptic number.

21111110210 is a deficient number, since it is larger than the sum of its proper divisors (16888888186).

21111110210 is a wasteful number, since it uses less digits than its factorization.

21111110210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111111028.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21111110210 its reverse (1201111112), we get a palindrome (22312221322).

It can be divided in two parts, 211111102 and 10, that added together give a palindrome (211111112).

The spelling of 21111110210 in words is "twenty-one billion, one hundred eleven million, one hundred ten thousand, two hundred ten".