260556021 has 48 divisors (see below), whose sum is σ = 430230528. Its totient is φ = 156265200.

The previous prime is 260556019. The next prime is 260556067. The reversal of 260556021 is 120655062.

260556021 is a `hidden beast` number, since 2 + 6 + 0 + 55 + 602 + 1 = 666.

It is not a de Polignac number, because 260556021 - 2¹ = 260556019 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 (260556001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 285556 + ... + 286466.

It is an arithmetic number, because the mean of its divisors is an integer number (8963136).

Almost surely, 2^260556021 is an apocalyptic number.

It is an amenable number.

260556021 is a deficient number, since it is larger than the sum of its proper divisors (169674507).

260556021 is a wasteful number, since it uses less digits than its factorization.

260556021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044 (or 1032 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 260556021 is about 16141.7477678224. The cubic root of 260556021 is about 638.7050811253.

The spelling of 260556021 in words is "two hundred sixty million, five hundred fifty-six thousand, twenty-one".