21210011200120 has 32 divisors (see below), whose sum is σ = 47726296189200. Its totient is φ = 8483334082048.

The previous prime is 21210011200087. The next prime is 21210011200141. The reversal of 21210011200120 is 2100211001212.

It is a self number, because there is not a number n which added to its sum of digits gives 21210011200120.

It is a congruent number.

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, 20437249 + ... + 21449968.

Almost surely, 2^{21210011200120} is an apocalyptic number.

21210011200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210011200120 is an abundant number, since it is smaller than the sum of its proper divisors (26516284989080).

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

21210011200120 is a wasteful number, since it uses less digits than its factorization.

21210011200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41899887 (or 41899883 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210011200120 its reverse (2100211001212), we get a palindrome (23310222201332).

The spelling of 21210011200120 in words is "twenty-one trillion, two hundred ten billion, eleven million, two hundred thousand, one hundred twenty".