21110201220128 has 48 divisors (see below), whose sum is σ = 44765512434720. Its totient is φ = 9767020870656.

The previous prime is 21110201220127. The next prime is 21110201220139. The reversal of 21110201220128 is 82102210201112.

It is not an unprimeable number, because it can be changed into a prime (21110201220127) 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 7 ways as a sum of consecutive naturals, for example, 403703225 + ... + 403755512.

It is an arithmetic number, because the mean of its divisors is an integer number (932614842390).

Almost surely, 2^{21110201220128} is an apocalyptic number.

It is an amenable number.

21110201220128 is an abundant number, since it is smaller than the sum of its proper divisors (23655311214592).

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

21110201220128 is a wasteful number, since it uses less digits than its factorization.

21110201220128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807458809 (or 807458801 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 21110201220128 in words is "twenty-one trillion, one hundred ten billion, two hundred one million, two hundred twenty thousand, one hundred twenty-eight".