21011101110 has 80 divisors (see below), whose sum is σ = 57562605936. Its totient is φ = 5497232832.

The previous prime is 21011101103. The next prime is 21011101127. The reversal of 21011101110 is 1110111012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21011101092 and 21011101101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 201784 + ... + 287643.

Almost surely, 2^21011101110 is an apocalyptic number.

21011101110 is an abundant number, since it is smaller than the sum of its proper divisors (36551504826).

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

21011101110 is a wasteful number, since it uses less digits than its factorization.

21011101110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489499 (or 489490 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 21011101110 its reverse (1110111012), we get a palindrome (22121212122).

The spelling of 21011101110 in words is "twenty-one billion, eleven million, one hundred one thousand, one hundred ten".