21110200120 has 32 divisors (see below), whose sum is σ = 47705385600. Its totient is φ = 8407202688.

The previous prime is 21110200093. The next prime is 21110200129. The reversal of 21110200120 is 2100201112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21110200097 and 21110200106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110200129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1143144 + ... + 1161463.

It is an arithmetic number, because the mean of its divisors is an integer number (1490793300).

Almost surely, 2^21110200120 is an apocalyptic number.

21110200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110200120 is an abundant number, since it is smaller than the sum of its proper divisors (26595185480).

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

21110200120 is a wasteful number, since it uses less digits than its factorization.

21110200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304847 (or 2304843 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21110200120 its reverse (2100201112), we get a palindrome (23210401232).

The spelling of 21110200120 in words is "twenty-one billion, one hundred ten million, two hundred thousand, one hundred twenty".