221001100001123 has 16 divisors (see below), whose sum is σ = 239027115952800. Its totient is φ = 203123514696960.

The previous prime is 221001100001117. The next prime is 221001100001161. The reversal of 221001100001123 is 321100001100122.

It is not a de Polignac number, because 221001100001123 - 2⁴⁰ = 219901588373347 is a prime.

It is a super-2 number, since 2×221001100001123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221001100001098 and 221001100001107.

It is not an unprimeable number, because it can be changed into a prime (221001100001323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36099728 + ... + 41775501.

It is an arithmetic number, because the mean of its divisors is an integer number (14939194747050).

Almost surely, 2^{221001100001123} is an apocalyptic number.

221001100001123 is a deficient number, since it is larger than the sum of its proper divisors (18026015951677).

221001100001123 is a wasteful number, since it uses less digits than its factorization.

221001100001123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77876182.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 221001100001123 its reverse (321100001100122), we get a palindrome (542101101101245).

The spelling of 221001100001123 in words is "two hundred twenty-one trillion, one billion, one hundred million, one thousand, one hundred twenty-three".