21120101100 has 108 divisors (see below), whose sum is σ = 75656918064. Its totient is φ = 4827450240.

The previous prime is 21120101089. The next prime is 21120101117. The reversal of 21120101100 is 110102112.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1669899 + ... + 1682498.

Almost surely, 2^21120101100 is an apocalyptic number.

21120101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120101100 is an abundant number, since it is smaller than the sum of its proper divisors (54536816964).

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

21120101100 is a wasteful number, since it uses less digits than its factorization.

21120101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3352424 (or 3352414 counting only the distinct ones).

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

Adding to 21120101100 its reverse (110102112), we get a palindrome (21230203212).

The spelling of 21120101100 in words is "twenty-one billion, one hundred twenty million, one hundred one thousand, one hundred".