221131001 has 8 divisors (see below), whose sum is σ = 272161344. Its totient is φ = 174960720.

The previous prime is 221130977. The next prime is 221131073. The reversal of 221131001 is 100131122.

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 221131001 - 2²² = 216936697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221131201) 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, 1214915 + ... + 1215096.

It is an arithmetic number, because the mean of its divisors is an integer number (34020168).

Almost surely, 2^221131001 is an apocalyptic number.

It is an amenable number.

221131001 is a deficient number, since it is larger than the sum of its proper divisors (51030343).

221131001 is a wasteful number, since it uses less digits than its factorization.

221131001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430031.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 221131001 is about 14870.4741350100. The cubic root of 221131001 is about 604.7137967376.

Adding to 221131001 its reverse (100131122), we get a palindrome (321262123).

The spelling of 221131001 in words is "two hundred twenty-one million, one hundred thirty-one thousand, one".