21112220210000 has 100 divisors (see below), whose sum is σ = 51304820717700. Its totient is φ = 8413493376000.

The previous prime is 21112220209979. The next prime is 21112220210027. The reversal of 21112220210000 is 1202221112.

It can be written as a sum of positive squares in 10 ways, for example, as 19217456947984 + 1894763262016 = 4383772^2 + 1376504^2 .

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

It is a congruent number.

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, 1234205 + ... + 6614204.

It is an arithmetic number, because the mean of its divisors is an integer number (513048207177).

Almost surely, 2^{21112220210000} is an apocalyptic number.

21112220210000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112220210000 is an abundant number, since it is smaller than the sum of its proper divisors (30192600507700).

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

21112220210000 is an equidigital number, since it uses as much as digits as its factorization.

21112220210000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7848706 (or 7848685 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21112220210000 its reverse (1202221112), we get a palindrome (21113422431112).

The spelling of 21112220210000 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, two hundred ten thousand".