21000000110 has 8 divisors (see below), whose sum is σ = 37800000216. Its totient is φ = 8400000040.

The previous prime is 21000000083. The next prime is 21000000113. The reversal of 21000000110 is 1100000012.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 21000000094 and 21000000103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000000113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049999996 + ... + 1050000015.

It is an arithmetic number, because the mean of its divisors is an integer number (4725000027).

Almost surely, 2^21000000110 is an apocalyptic number.

21000000110 is a deficient number, since it is larger than the sum of its proper divisors (16800000106).

21000000110 is a wasteful number, since it uses less digits than its factorization.

21000000110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100000018.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 21000000110 its reverse (1100000012), we get a palindrome (22100000122).

The spelling of 21000000110 in words is "twenty-one billion, one hundred ten", and thus it is an aban number.