204221871 has 16 divisors (see below), whose sum is σ = 345772800. Its totient is φ = 116698104.

The previous prime is 204221827. The next prime is 204221881. The reversal of 204221871 is 178122402.

It is not a de Polignac number, because 204221871 - 2²² = 200027567 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204221821) 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, 540081 + ... + 540458.

It is an arithmetic number, because the mean of its divisors is an integer number (21610800).

Almost surely, 2^204221871 is an apocalyptic number.

204221871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

204221871 is a deficient number, since it is larger than the sum of its proper divisors (141550929).

204221871 is a wasteful number, since it uses less digits than its factorization.

204221871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080555 (or 1080549 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 204221871 is about 14290.6217849329. The cubic root of 204221871 is about 588.8898698070.

The spelling of 204221871 in words is "two hundred four million, two hundred twenty-one thousand, eight hundred seventy-one".