221161393 has 4 divisors (see below), whose sum is σ = 221635440. Its totient is φ = 220687348.

The previous prime is 221161363. The next prime is 221161487. The reversal of 221161393 is 393161122.

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, and also an emirpimes, since its reverse is a distinct semiprime: 393161122 = 2 ⋅196580561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221161393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221161363) 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, 236323 + ... + 237256.

It is an arithmetic number, because the mean of its divisors is an integer number (55408860).

Almost surely, 2^221161393 is an apocalyptic number.

It is an amenable number.

221161393 is a deficient number, since it is larger than the sum of its proper divisors (474047).

221161393 is an equidigital number, since it uses as much as digits as its factorization.

221161393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474046.

The product of its digits is 1944, while the sum is 28.

The square root of 221161393 is about 14871.4959906527. The cubic root of 221161393 is about 604.7414992001.

The spelling of 221161393 in words is "two hundred twenty-one million, one hundred sixty-one thousand, three hundred ninety-three".