21002000110 has 48 divisors (see below), whose sum is σ = 46783179936. Its totient is φ = 6646783104.

The previous prime is 21002000099. The next prime is 21002000147. The reversal of 21002000110 is 1100020012.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 21002000093 and 21002000102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 875829 + ... + 899488.

It is an arithmetic number, because the mean of its divisors is an integer number (974649582).

Almost surely, 2^21002000110 is an apocalyptic number.

21002000110 is an abundant number, since it is smaller than the sum of its proper divisors (25781179826).

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

21002000110 is a wasteful number, since it uses less digits than its factorization.

21002000110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775357 (or 1775344 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21002000110 its reverse (1100020012), we get a palindrome (22102020122).

The spelling of 21002000110 in words is "twenty-one billion, two million, one hundred ten", and thus it is an aban number.