221135331 has 4 divisors (see below), whose sum is σ = 294847112. Its totient is φ = 147423552.

The previous prime is 221135311. The next prime is 221135339. The reversal of 221135331 is 133531122.

221135331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221135331 - 2¹³ = 221127139 is a prime.

It is a super-2 number, since 2×221135331² = 97801669232959122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221135298 and 221135307.

It is not an unprimeable number, because it can be changed into a prime (221135339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36855886 + ... + 36855891.

It is an arithmetic number, because the mean of its divisors is an integer number (73711778).

Almost surely, 2^221135331 is an apocalyptic number.

221135331 is a deficient number, since it is larger than the sum of its proper divisors (73711781).

221135331 is an equidigital number, since it uses as much as digits as its factorization.

221135331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73711780.

The product of its digits is 540, while the sum is 21.

The square root of 221135331 is about 14870.6197248131. The cubic root of 221135331 is about 604.7177437096.

Adding to 221135331 its reverse (133531122), we get a palindrome (354666453).

The spelling of 221135331 in words is "two hundred twenty-one million, one hundred thirty-five thousand, three hundred thirty-one".