221100121 has 8 divisors (see below), whose sum is σ = 241380000. Its totient is φ = 200850240.

The previous prime is 221100107. The next prime is 221100133. The reversal of 221100121 is 121001122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221100121 - 2⁷ = 221099993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221100098 and 221100107.

It is not an unprimeable number, because it can be changed into a prime (221100101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9630 + ... + 23128.

It is an arithmetic number, because the mean of its divisors is an integer number (30172500).

Almost surely, 2^221100121 is an apocalyptic number.

It is an amenable number.

221100121 is a deficient number, since it is larger than the sum of its proper divisors (20279879).

221100121 is a wasteful number, since it uses less digits than its factorization.

221100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14999.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221100121 is about 14869.4357996529. The cubic root of 221100121 is about 604.6856468607.

Adding to 221100121 its reverse (121001122), we get a palindrome (342101243).

The spelling of 221100121 in words is "two hundred twenty-one million, one hundred thousand, one hundred twenty-one".