249225021 has 12 divisors (see below), whose sum is σ = 360128860. Its totient is φ = 166086720.

The previous prime is 249225017. The next prime is 249225037. The reversal of 249225021 is 120522942.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 246929796 + 2295225 = 15714^2 + 1515^2 .

It is not a de Polignac number, because 249225021 - 2² = 249225017 is a prime.

It is a super-2 number, since 2×249225021² = 124226222184900882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249225001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41361 + ... + 47001.

Almost surely, 2^249225021 is an apocalyptic number.

It is an amenable number.

249225021 is a deficient number, since it is larger than the sum of its proper divisors (110903839).

249225021 is a wasteful number, since it uses less digits than its factorization.

249225021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556 (or 10553 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 249225021 is about 15786.8622911584. The cubic root of 249225021 is about 629.3089095951.

Adding to 249225021 its reverse (120522942), we get a palindrome (369747963).

The spelling of 249225021 in words is "two hundred forty-nine million, two hundred twenty-five thousand, twenty-one".