21110202120 has 64 divisors (see below), whose sum is σ = 72377838720. Its totient is φ = 4825188864.

The previous prime is 21110202109. The next prime is 21110202121. The reversal of 21110202120 is 2120201112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21110202096 and 21110202105.

It is not an unprimeable number, because it can be changed into a prime (21110202121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12564757 + ... + 12566436.

It is an arithmetic number, because the mean of its divisors is an integer number (1130903730).

Almost surely, 2^21110202120 is an apocalyptic number.

21110202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110202120 is an abundant number, since it is smaller than the sum of its proper divisors (51267636600).

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

21110202120 is a wasteful number, since it uses less digits than its factorization.

21110202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25131214 (or 25131210 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21110202120 its reverse (2120201112), we get a palindrome (23230403232).

The spelling of 21110202120 in words is "twenty-one billion, one hundred ten million, two hundred two thousand, one hundred twenty".