204260721 has 16 divisors (see below), whose sum is σ = 314012544. Its totient is φ = 115686144.

The previous prime is 204260713. The next prime is 204260737. The reversal of 204260721 is 127062402.

It is not a de Polignac number, because 204260721 - 2³ = 204260713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204260691 and 204260700.

It is not an unprimeable number, because it can be changed into a prime (204260701) 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, 40666 + ... + 45411.

It is an arithmetic number, because the mean of its divisors is an integer number (19625784).

Almost surely, 2^204260721 is an apocalyptic number.

204260721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204260721 is a deficient number, since it is larger than the sum of its proper divisors (109751823).

204260721 is a wasteful number, since it uses less digits than its factorization.

204260721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86200.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 204260721 is about 14291.9810033459. The cubic root of 204260721 is about 588.9272097856.

The spelling of 204260721 in words is "two hundred four million, two hundred sixty thousand, seven hundred twenty-one".