21100021221110 has 64 divisors (see below), whose sum is σ = 43102838016000. Its totient is φ = 7372414392192.

The previous prime is 21100021221101. The next prime is 21100021221121. The reversal of 21100021221110 is 1112212000112.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2624510 + ... + 7006289.

It is an arithmetic number, because the mean of its divisors is an integer number (673481844000).

Almost surely, 2^{21100021221110} is an apocalyptic number.

21100021221110 is an abundant number, since it is smaller than the sum of its proper divisors (22002816794890).

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

21100021221110 is a wasteful number, since it uses less digits than its factorization.

21100021221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9631725.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21100021221110 its reverse (1112212000112), we get a palindrome (22212233221222).

The spelling of 21100021221110 in words is "twenty-one trillion, one hundred billion, twenty-one million, two hundred twenty-one thousand, one hundred ten".