221491419 has 8 divisors (see below), whose sum is σ = 312693840. Its totient is φ = 138974976.

The previous prime is 221491397. The next prime is 221491423. The reversal of 221491419 is 914194122.

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

It is not a de Polignac number, because 221491419 - 2⁸ = 221491163 is a prime.

It is a super-2 number, since 2×221491419² = 98116897381267122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221491419.

It is not an unprimeable number, because it can be changed into a prime (221491469) 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, 2171434 + ... + 2171535.

It is an arithmetic number, because the mean of its divisors is an integer number (39086730).

Almost surely, 2^221491419 is an apocalyptic number.

221491419 is a deficient number, since it is larger than the sum of its proper divisors (91202421).

221491419 is a wasteful number, since it uses less digits than its factorization.

221491419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4342989.

The product of its digits is 5184, while the sum is 33.

The square root of 221491419 is about 14882.5877790121. The cubic root of 221491419 is about 605.0421562957.

The spelling of 221491419 in words is "two hundred twenty-one million, four hundred ninety-one thousand, four hundred nineteen".