21011120110 has 16 divisors (see below), whose sum is σ = 37821676032. Its totient is φ = 8404079200.

The previous prime is 21011120093. The next prime is 21011120129. The reversal of 21011120110 is 1102111012.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385875 + ... + 436945.

It is an arithmetic number, because the mean of its divisors is an integer number (2363854752).

Almost surely, 2^21011120110 is an apocalyptic number.

21011120110 is a deficient number, since it is larger than the sum of its proper divisors (16810555922).

21011120110 is a wasteful number, since it uses less digits than its factorization.

21011120110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92219.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21011120110 its reverse (1102111012), we get a palindrome (22113231122).

It can be divided in two parts, 2101 and 1120110, that added together give a palindrome (1122211).

The spelling of 21011120110 in words is "twenty-one billion, eleven million, one hundred twenty thousand, one hundred ten".