21110012010 has 48 divisors (see below), whose sum is σ = 55280927520. Its totient is φ = 5588834400.

The previous prime is 21110012003. The next prime is 21110012039. The reversal of 21110012010 is 1021001112.

It is a happy number.

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 = 21110011983 and 21110012001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 831216 + ... + 856235.

It is an arithmetic number, because the mean of its divisors is an integer number (1151685990).

Almost surely, 2^21110012010 is an apocalyptic number.

21110012010 is an abundant number, since it is smaller than the sum of its proper divisors (34170915510).

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

21110012010 is a wasteful number, since it uses less digits than its factorization.

21110012010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687603 (or 1687600 counting only the distinct ones).

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

Adding to 21110012010 its reverse (1021001112), we get a palindrome (22131013122).

The spelling of 21110012010 in words is "twenty-one billion, one hundred ten million, twelve thousand, ten".