21111011110 has 64 divisors (see below), whose sum is σ = 44653400064. Its totient is φ = 7035206400.

The previous prime is 21111011107. The next prime is 21111011147. The reversal of 21111011110 is 1111011112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 764199 + ... + 791341.

It is an arithmetic number, because the mean of its divisors is an integer number (697709376).

Almost surely, 2^21111011110 is an apocalyptic number.

21111011110 is an abundant number, since it is smaller than the sum of its proper divisors (23542388954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111011110 is a wasteful number, since it uses less digits than its factorization.

21111011110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27469.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 21111011110 its reverse (1111011112), we get a palindrome (22222022222).

The spelling of 21111011110 in words is "twenty-one billion, one hundred eleven million, eleven thousand, one hundred ten".