249285021 has 8 divisors (see below), whose sum is σ = 341363424. Its totient is φ = 161698320.

The previous prime is 249285019. The next prime is 249285079. The reversal of 249285021 is 120582942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 249285021 - 2¹ = 249285019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249285121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1122795 + ... + 1123016.

It is an arithmetic number, because the mean of its divisors is an integer number (42670428).

Almost surely, 2^249285021 is an apocalyptic number.

It is an amenable number.

249285021 is a deficient number, since it is larger than the sum of its proper divisors (92078403).

249285021 is a wasteful number, since it uses less digits than its factorization.

249285021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245851.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 249285021 is about 15788.7624910884. The cubic root of 249285021 is about 629.3594068054.

The spelling of 249285021 in words is "two hundred forty-nine million, two hundred eighty-five thousand, twenty-one".