221001131 has 12 divisors (see below), whose sum is σ = 239956920. Its totient is φ = 203448960.

The previous prime is 221001119. The next prime is 221001133. The reversal of 221001131 is 131100122.

It is not a de Polignac number, because 221001131 - 2¹⁰ = 221000107 is a prime.

It is a super-2 number, since 2×221001131² = 97682999806558322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69251 + ... + 72371.

It is an arithmetic number, because the mean of its divisors is an integer number (19996410).

Almost surely, 2^221001131 is an apocalyptic number.

221001131 is a deficient number, since it is larger than the sum of its proper divisors (18955789).

221001131 is a wasteful number, since it uses less digits than its factorization.

221001131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3566 (or 3553 counting only the distinct ones).

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

The square root of 221001131 is about 14866.1067869163. The cubic root of 221001131 is about 604.5953909663.

Adding to 221001131 its reverse (131100122), we get a palindrome (352101253).

The spelling of 221001131 in words is "two hundred twenty-one million, one thousand, one hundred thirty-one".