21100120202000 has 120 divisors (see below), whose sum is σ = 59349901642200. Its totient is φ = 7234326892800.

The previous prime is 21100120201957. The next prime is 21100120202017. The reversal of 21100120202000 is 20202100112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4996047513856 + 16104072688144 = 2235184^2 + 4012988^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107555675 + ... + 107751674.

It is an arithmetic number, because the mean of its divisors is an integer number (494582513685).

Almost surely, 2^{21100120202000} is an apocalyptic number.

21100120202000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100120202000 is an abundant number, since it is smaller than the sum of its proper divisors (38249781440200).

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

21100120202000 is a wasteful number, since it uses less digits than its factorization.

21100120202000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215307386 (or 215307363 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100120202000 its reverse (20202100112), we get a palindrome (21120322302112).

The spelling of 21100120202000 in words is "twenty-one trillion, one hundred billion, one hundred twenty million, two hundred two thousand".