185481021 has 24 divisors (see below), whose sum is σ = 286152160. Its totient is φ = 106492320.

The previous prime is 185480989. The next prime is 185481031. The reversal of 185481021 is 120184581.

It is a happy number.

It is not a de Polignac number, because 185481021 - 2⁵ = 185480989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 185481021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185481031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6550 + ... + 20343.

Almost surely, 2^185481021 is an apocalyptic number.

185481021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

185481021 is a deficient number, since it is larger than the sum of its proper divisors (100671139).

185481021 is a wasteful number, since it uses less digits than its factorization.

185481021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26937 (or 26926 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 185481021 is about 13619.1417130449. The cubic root of 185481021 is about 570.2953440179.

The spelling of 185481021 in words is "one hundred eighty-five million, four hundred eighty-one thousand, twenty-one".