21210111220000 has 120 divisors (see below), whose sum is σ = 52198321190400. Its totient is φ = 8481074592000.

The previous prime is 21210111219949. The next prime is 21210111220033. The reversal of 21210111220000 is 2211101212.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 57395821 + ... + 57764179.

It is an arithmetic number, because the mean of its divisors is an integer number (434986009920).

Almost surely, 2^{21210111220000} is an apocalyptic number.

21210111220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210111220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26099160595200).

21210111220000 is an abundant number, since it is smaller than the sum of its proper divisors (30988209970400).

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

21210111220000 is an equidigital number, since it uses as much as digits as its factorization.

21210111220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371268 (or 371245 counting only the distinct ones).

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

Adding to 21210111220000 its reverse (2211101212), we get a palindrome (21212322321212).

The spelling of 21210111220000 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, two hundred twenty thousand".