221240131 has 16 divisors (see below), whose sum is σ = 260424640. Its totient is φ = 183980160.

The previous prime is 221240119. The next prime is 221240143. The reversal of 221240131 is 131042122.

It is an interprime number because it is at equal distance from previous prime (221240119) and next prime (221240143).

It is not a de Polignac number, because 221240131 - 2⁷ = 221240003 is a prime.

It is a super-2 number, since 2×221240131² = 97894391129794322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221240111) 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, 108025 + ... + 110053.

It is an arithmetic number, because the mean of its divisors is an integer number (16276540).

Almost surely, 2^221240131 is an apocalyptic number.

221240131 is a deficient number, since it is larger than the sum of its proper divisors (39184509).

221240131 is a wasteful number, since it uses less digits than its factorization.

221240131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 221240131 is about 14874.1430341381. The cubic root of 221240131 is about 604.8132574846.

Adding to 221240131 its reverse (131042122), we get a palindrome (352282253).

The spelling of 221240131 in words is "two hundred twenty-one million, two hundred forty thousand, one hundred thirty-one".