221379019 has 4 divisors (see below), whose sum is σ = 221749200. Its totient is φ = 221008840.

The previous prime is 221379017. The next prime is 221379031. The reversal of 221379019 is 910973122.

It is a happy number.

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 221379019 - 2¹ = 221379017 is a prime.

It is a super-2 number, since 2×221379019² = 98017340106804722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221379017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184192 + ... + 185389.

It is an arithmetic number, because the mean of its divisors is an integer number (55437300).

Almost surely, 2^221379019 is an apocalyptic number.

221379019 is a deficient number, since it is larger than the sum of its proper divisors (370181).

221379019 is an equidigital number, since it uses as much as digits as its factorization.

221379019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370180.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 221379019 is about 14878.8110748137. The cubic root of 221379019 is about 604.9397922919.

The spelling of 221379019 in words is "two hundred twenty-one million, three hundred seventy-nine thousand, nineteen".