221335397 has 4 divisors (see below), whose sum is σ = 222004416. Its totient is φ = 220666380.

The previous prime is 221335391. The next prime is 221335421. The reversal of 221335397 is 793533122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221335397 - 2⁶ = 221335333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221335391) 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, 334013 + ... + 334674.

It is an arithmetic number, because the mean of its divisors is an integer number (55501104).

Almost surely, 2^221335397 is an apocalyptic number.

It is an amenable number.

221335397 is a deficient number, since it is larger than the sum of its proper divisors (669019).

221335397 is an equidigital number, since it uses as much as digits as its factorization.

221335397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669018.

The product of its digits is 34020, while the sum is 35.

The square root of 221335397 is about 14877.3450924552. The cubic root of 221335397 is about 604.9000558899.

The spelling of 221335397 in words is "two hundred twenty-one million, three hundred thirty-five thousand, three hundred ninety-seven".