221100001120121 has 4 divisors (see below), whose sum is σ = 221101858145700. Its totient is φ = 221098144094544.

The previous prime is 221100001120087. The next prime is 221100001120129. The reversal of 221100001120121 is 121021100001122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70397738192896 + 150702262927225 = 8390336^2 + 12276085^2 .

It is a cyclic number.

It is not a de Polignac number, because 221100001120121 - 2²² = 221099996925817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221100001120096 and 221100001120105.

It is not an unprimeable number, because it can be changed into a prime (221100001120129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928334186 + ... + 928572323.

It is an arithmetic number, because the mean of its divisors is an integer number (55275464536425).

Almost surely, 2^{221100001120121} is an apocalyptic number.

It is an amenable number.

221100001120121 is a deficient number, since it is larger than the sum of its proper divisors (1857025579).

221100001120121 is a wasteful number, since it uses less digits than its factorization.

221100001120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857025578.

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

Adding to 221100001120121 its reverse (121021100001122), we get a palindrome (342121101121243).

The spelling of 221100001120121 in words is "two hundred twenty-one trillion, one hundred billion, one million, one hundred twenty thousand, one hundred twenty-one".