21112221210000 has 100 divisors (see below), whose sum is σ = 68153065125552. Its totient is φ = 5629925648000.

The previous prime is 21112221209983. The next prime is 21112221210007. The reversal of 21112221210000 is 1212221112.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21112221210007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 351840354 + ... + 351900353.

Almost surely, 2^{21112221210000} is an apocalyptic number.

21112221210000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112221210000 is an abundant number, since it is smaller than the sum of its proper divisors (47040843915552).

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

21112221210000 is an equidigital number, since it uses as much as digits as its factorization.

21112221210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703740738 (or 703740717 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21112221210000 its reverse (1212221112), we get a palindrome (21113433431112).

The spelling of 21112221210000 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, two hundred ten thousand".