221542131 has 8 divisors (see below), whose sum is σ = 296213760. Its totient is φ = 147282632.

The previous prime is 221542103. The next prime is 221542163. The reversal of 221542131 is 131245122.

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 221542131 - 2¹⁵ = 221509363 is a prime.

It is a super-2 number, since 2×221542131² = 98161831616042322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221542098 and 221542107.

It is not an unprimeable number, because it can be changed into a prime (221542171) 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 7 ways as a sum of consecutive naturals, for example, 101775 + ... + 103928.

It is an arithmetic number, because the mean of its divisors is an integer number (37026720).

Almost surely, 2^221542131 is an apocalyptic number.

221542131 is a deficient number, since it is larger than the sum of its proper divisors (74671629).

221542131 is a wasteful number, since it uses less digits than its factorization.

221542131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206065.

The product of its digits is 480, while the sum is 21.

The square root of 221542131 is about 14884.2914174643. The cubic root of 221542131 is about 605.0883289745.

Adding to 221542131 its reverse (131245122), we get a palindrome (352787253).

The spelling of 221542131 in words is "two hundred twenty-one million, five hundred forty-two thousand, one hundred thirty-one".