221253331 has 4 divisors (see below), whose sum is σ = 238272832. Its totient is φ = 204233832.

The previous prime is 221253301. The next prime is 221253337. The reversal of 221253331 is 133352122.

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

It is a cyclic number.

It is not a de Polignac number, because 221253331 - 2⁹ = 221252819 is a prime.

It is a super-2 number, since 2×221253331² = 97906072957191122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221253337) 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 3 ways as a sum of consecutive naturals, for example, 8509731 + ... + 8509756.

It is an arithmetic number, because the mean of its divisors is an integer number (59568208).

Almost surely, 2^221253331 is an apocalyptic number.

221253331 is a deficient number, since it is larger than the sum of its proper divisors (17019501).

221253331 is a wasteful number, since it uses less digits than its factorization.

221253331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17019500.

The product of its digits is 1080, while the sum is 22.

The square root of 221253331 is about 14874.5867505622. The cubic root of 221253331 is about 604.8252857066.

The spelling of 221253331 in words is "two hundred twenty-one million, two hundred fifty-three thousand, three hundred thirty-one".