221121401 has 8 divisors (see below), whose sum is σ = 224985600. Its totient is φ = 217265040.

The previous prime is 221121391. The next prime is 221121403. The reversal of 221121401 is 104121122.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221121401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221121403) 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, 97640 + ... + 99878.

It is an arithmetic number, because the mean of its divisors is an integer number (28123200).

Almost surely, 2^221121401 is an apocalyptic number.

It is an amenable number.

221121401 is a deficient number, since it is larger than the sum of its proper divisors (3864199).

221121401 is a wasteful number, since it uses less digits than its factorization.

221121401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 221121401 is about 14870.1513442197. The cubic root of 221121401 is about 604.7050457613.

Adding to 221121401 its reverse (104121122), we get a palindrome (325242523).

The spelling of 221121401 in words is "two hundred twenty-one million, one hundred twenty-one thousand, four hundred one".