221013131 has 8 divisors (see below), whose sum is σ = 224550144. Its totient is φ = 217488040.

The previous prime is 221013119. The next prime is 221013151. The reversal of 221013131 is 131310122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221013131 is a prime.

It is a super-2 number, since 2×221013131² = 97693608148846322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221013151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39026 + ... + 44328.

It is an arithmetic number, because the mean of its divisors is an integer number (28068768).

Almost surely, 2^221013131 is an apocalyptic number.

221013131 is a deficient number, since it is larger than the sum of its proper divisors (3537013).

221013131 is an equidigital number, since it uses as much as digits as its factorization.

221013131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5961.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 221013131 is about 14866.5103840814. The cubic root of 221013131 is about 604.6063336153.

Adding to 221013131 its reverse (131310122), we get a palindrome (352323253).

The spelling of 221013131 in words is "two hundred twenty-one million, thirteen thousand, one hundred thirty-one".