221000122100001 has 32 divisors (see below), whose sum is σ = 320439707354880. Its totient is φ = 134916004878336.

The previous prime is 221000122099997. The next prime is 221000122100041. The reversal of 221000122100001 is 100001221000122.

It is not a de Polignac number, because 221000122100001 - 2² = 221000122099997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221000122100001.

It is not an unprimeable number, because it can be changed into a prime (221000122100041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85450485 + ... + 87998781.

It is an arithmetic number, because the mean of its divisors is an integer number (10013740854840).

Almost surely, 2^{221000122100001} is an apocalyptic number.

It is an amenable number.

221000122100001 is a deficient number, since it is larger than the sum of its proper divisors (99439585254879).

221000122100001 is a wasteful number, since it uses less digits than its factorization.

221000122100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594313.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221000122100001 its reverse (100001221000122), we get a palindrome (321001343100123).

It can be divided in two parts, 221000122 and 100001, that multiplied together give a palindrome (22100233200122).

The spelling of 221000122100001 in words is "two hundred twenty-one trillion, one hundred twenty-two million, one hundred thousand, one".