21102110210120 has 48 divisors (see below), whose sum is σ = 50110204958460. Its totient is φ = 7996589126784.

The previous prime is 21102110210113. The next prime is 21102110210123. The reversal of 21102110210120 is 2101201120112.

It can be written as a sum of positive squares in 2 ways, for example, as 18146867287396 + 2955242922724 = 4259914^2 + 1719082^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102110210095 and 21102110210104.

It is not an unprimeable number, because it can be changed into a prime (21102110210123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 730668047 + ... + 730696926.

Almost surely, 2^{21102110210120} is an apocalyptic number.

21102110210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102110210120 is an abundant number, since it is smaller than the sum of its proper divisors (29008094748340).

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

21102110210120 is a wasteful number, since it uses less digits than its factorization.

21102110210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461365022 (or 1461364999 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21102110210120 its reverse (2101201120112), we get a palindrome (23203311330232).

The spelling of 21102110210120 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, two hundred ten thousand, one hundred twenty".