221155131 has 16 divisors (see below), whose sum is σ = 309346560. Its totient is φ = 140343840.

The previous prime is 221155043. The next prime is 221155153. The reversal of 221155131 is 131551122.

It is not a de Polignac number, because 221155131 - 2¹⁷ = 221024059 is a prime.

It is a super-2 number, since 2×221155131² = 97819183935254322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221155098 and 221155107.

It is not an unprimeable number, because it can be changed into a prime (221155171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11725 + ... + 24078.

It is an arithmetic number, because the mean of its divisors is an integer number (19334160).

Almost surely, 2^221155131 is an apocalyptic number.

221155131 is a deficient number, since it is larger than the sum of its proper divisors (88191429).

221155131 is a wasteful number, since it uses less digits than its factorization.

221155131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35906.

The product of its digits is 300, while the sum is 21.

The square root of 221155131 is about 14871.2854521726. The cubic root of 221155131 is about 604.7357915628.

The spelling of 221155131 in words is "two hundred twenty-one million, one hundred fifty-five thousand, one hundred thirty-one".