221040331 has 4 divisors (see below), whose sum is σ = 227014432. Its totient is φ = 215066232.

The previous prime is 221040301. The next prime is 221040353. The reversal of 221040331 is 133040122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133040122 = 2 ⋅66520061.

It is a cyclic number.

It is not a de Polignac number, because 221040331 - 2⁵ = 221040299 is a prime.

It is a super-2 number, since 2×221040331² = 97717655857179122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221040301) 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, 2986995 + ... + 2987068.

It is an arithmetic number, because the mean of its divisors is an integer number (56753608).

Almost surely, 2^221040331 is an apocalyptic number.

221040331 is a deficient number, since it is larger than the sum of its proper divisors (5974101).

221040331 is an equidigital number, since it uses as much as digits as its factorization.

221040331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5974100.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221040331 is about 14867.4251637599. The cubic root of 221040331 is about 604.6311354866.

Adding to 221040331 its reverse (133040122), we get a palindrome (354080453).

The spelling of 221040331 in words is "two hundred twenty-one million, forty thousand, three hundred thirty-one".