204221031 has 16 divisors (see below), whose sum is σ = 317067264. Its totient is φ = 114495264.

The previous prime is 204221029. The next prime is 204221057. The reversal of 204221031 is 130122402.

It is not a de Polignac number, because 204221031 - 2¹ = 204221029 is a prime.

It is a super-2 number, since 2×204221031² = 83412459005405922, 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 204221031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204221431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90631 + ... + 92856.

It is an arithmetic number, because the mean of its divisors is an integer number (19816704).

Almost surely, 2^204221031 is an apocalyptic number.

204221031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

204221031 is a deficient number, since it is larger than the sum of its proper divisors (112846233).

204221031 is a wasteful number, since it uses less digits than its factorization.

204221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183550.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 204221031 is about 14290.5923949989. The cubic root of 204221031 is about 588.8890624039.

Adding to 204221031 its reverse (130122402), we get a palindrome (334343433).

The spelling of 204221031 in words is "two hundred four million, two hundred twenty-one thousand, thirty-one".