204221919 has 16 divisors (see below), whose sum is σ = 297304704. Its totient is φ = 123664800.

The previous prime is 204221917. The next prime is 204221923. The reversal of 204221919 is 919122402.

It is a happy number.

It is not a de Polignac number, because 204221919 - 2¹ = 204221917 is a prime.

It is a super-2 number, since 2×204221919² = 83413184400085122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204221917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55404 + ... + 58974.

It is an arithmetic number, because the mean of its divisors is an integer number (18581544).

Almost surely, 2^204221919 is an apocalyptic number.

204221919 is a deficient number, since it is larger than the sum of its proper divisors (93082785).

204221919 is a wasteful number, since it uses less digits than its factorization.

204221919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 204221919 is about 14290.6234643559. The cubic root of 204221919 is about 588.8899159443.

The spelling of 204221919 in words is "two hundred four million, two hundred twenty-one thousand, nine hundred nineteen".