21210110120 has 16 divisors (see below), whose sum is σ = 47722747860. Its totient is φ = 8484044032.

The previous prime is 21210110111. The next prime is 21210110137. The reversal of 21210110120 is 2101101212.

It can be written as a sum of positive squares in 2 ways, for example, as 19277100964 + 1933009156 = 138842^2 + 43966^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265126337 + ... + 265126416.

Almost surely, 2^21210110120 is an apocalyptic number.

21210110120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210110120 is an abundant number, since it is smaller than the sum of its proper divisors (26512637740).

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

21210110120 is a wasteful number, since it uses less digits than its factorization.

21210110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530252764 (or 530252760 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21210110120 its reverse (2101101212), we get a palindrome (23311211332).

The spelling of 21210110120 in words is "twenty-one billion, two hundred ten million, one hundred ten thousand, one hundred twenty".