21012101110 has 128 divisors (see below), whose sum is σ = 51819264000. Its totient is φ = 6045298560.

The previous prime is 21012101093. The next prime is 21012101251. The reversal of 21012101110 is 1110121012.

21012101110 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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 63 ways as a sum of consecutive naturals, for example, 469071 + ... + 511909.

It is an arithmetic number, because the mean of its divisors is an integer number (404838000).

Almost surely, 2^21012101110 is an apocalyptic number.

21012101110 is an abundant number, since it is smaller than the sum of its proper divisors (30807162890).

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

21012101110 is a wasteful number, since it uses less digits than its factorization.

21012101110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42891 (or 42877 counting only the distinct ones).

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

Adding to 21012101110 its reverse (1110121012), we get a palindrome (22122222122).

The spelling of 21012101110 in words is "twenty-one billion, twelve million, one hundred one thousand, one hundred ten".