21201012110120 has 32 divisors (see below), whose sum is σ = 48022426773000. Its totient is φ = 8423489372928.

The previous prime is 21201012110111. The next prime is 21201012110147. The reversal of 21201012110120 is 2101121010212.

It can be written as a sum of positive squares in 4 ways, for example, as 14477705381764 + 6723306728356 = 3804958^2 + 2592934^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21201012110095 and 21201012110104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1778602439 + ... + 1778614358.

Almost surely, 2^{21201012110120} is an apocalyptic number.

21201012110120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201012110120 is an abundant number, since it is smaller than the sum of its proper divisors (26821414662880).

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

21201012110120 is a wasteful number, since it uses less digits than its factorization.

21201012110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557216957 (or 3557216953 counting only the distinct ones).

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

Adding to 21201012110120 its reverse (2101121010212), we get a palindrome (23302133120332).

The spelling of 21201012110120 in words is "twenty-one trillion, two hundred one billion, twelve million, one hundred ten thousand, one hundred twenty".