221393355 has 8 divisors (see below), whose sum is σ = 354229392. Its totient is φ = 118076448.

The previous prime is 221393353. The next prime is 221393371. The reversal of 221393355 is 553393122.

It is a happy number.

221393355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221393355 - 2¹ = 221393353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221393353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7379764 + ... + 7379793.

It is an arithmetic number, because the mean of its divisors is an integer number (44278674).

Almost surely, 2^221393355 is an apocalyptic number.

221393355 is a deficient number, since it is larger than the sum of its proper divisors (132836037).

221393355 is a wasteful number, since it uses less digits than its factorization.

221393355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14759565.

The product of its digits is 24300, while the sum is 33.

The square root of 221393355 is about 14879.2928259377. The cubic root of 221393355 is about 604.9528501834.

The spelling of 221393355 in words is "two hundred twenty-one million, three hundred ninety-three thousand, three hundred fifty-five".