21011011100 has 18 divisors (see below), whose sum is σ = 45593894304. Its totient is φ = 8404404400.

The previous prime is 21011011079. The next prime is 21011011111. The reversal of 21011011100 is 111011012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105054956 + ... + 105055155.

It is an arithmetic number, because the mean of its divisors is an integer number (2532994128).

Almost surely, 2^21011011100 is an apocalyptic number.

21011011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011011100 is an abundant number, since it is smaller than the sum of its proper divisors (24582883204).

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

21011011100 is a wasteful number, since it uses less digits than its factorization.

21011011100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210110125 (or 210110118 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21011011100 its reverse (111011012), we get a palindrome (21122022112).

The spelling of 21011011100 in words is "twenty-one billion, eleven million, eleven thousand, one hundred".