21210010112100 has 144 divisors (see below), whose sum is σ = 64038099299328. Its totient is φ = 5409894188160.

The previous prime is 21210010112099. The next prime is 21210010112201. The reversal of 21210010112100 is 121101001212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 365995327 + ... + 366053273.

It is an arithmetic number, because the mean of its divisors is an integer number (444709022912).

Almost surely, 2^{21210010112100} is an apocalyptic number.

21210010112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210010112100 is an abundant number, since it is smaller than the sum of its proper divisors (42828089187228).

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

21210010112100 is a wasteful number, since it uses less digits than its factorization.

21210010112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111034 (or 111027 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210010112100 its reverse (121101001212), we get a palindrome (21331111113312).

The spelling of 21210010112100 in words is "twenty-one trillion, two hundred ten billion, ten million, one hundred twelve thousand, one hundred".