249144021 has 24 divisors (see below), whose sum is σ = 420854720. Its totient is φ = 139055616.

The previous prime is 249144013. The next prime is 249144023. The reversal of 249144021 is 120441942.

It is a happy number.

249144021 is a `hidden beast` number, since 249 + 14 + 402 + 1 = 666.

It is not a de Polignac number, because 249144021 - 2³ = 249144013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249144023) 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, 43276 + ... + 48693.

Almost surely, 2^249144021 is an apocalyptic number.

249144021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

249144021 is a deficient number, since it is larger than the sum of its proper divisors (171710699).

249144021 is a wasteful number, since it uses less digits than its factorization.

249144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92025 (or 92022 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 249144021 is about 15784.2966583880. The cubic root of 249144021 is about 629.2407255034.

Adding to 249144021 its reverse (120441942), we get a palindrome (369585963).

The spelling of 249144021 in words is "two hundred forty-nine million, one hundred forty-four thousand, twenty-one".