21012001110 has 24 divisors (see below), whose sum is σ = 54631203120. Its totient is φ = 5603200272.

The previous prime is 21012001079. The next prime is 21012001111. The reversal of 21012001110 is 1110021012.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21012001092 and 21012001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012001111) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 116733250 + ... + 116733429.

It is an arithmetic number, because the mean of its divisors is an integer number (2276300130).

Almost surely, 2^21012001110 is an apocalyptic number.

21012001110 is an abundant number, since it is smaller than the sum of its proper divisors (33619202010).

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

21012001110 is a wasteful number, since it uses less digits than its factorization.

21012001110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233466692 (or 233466689 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21012001110 its reverse (1110021012), we get a palindrome (22122022122).

The spelling of 21012001110 in words is "twenty-one billion, twelve million, one thousand, one hundred ten".