249422921 has 4 divisors (see below), whose sum is σ = 272097744. Its totient is φ = 226748100.

The previous prime is 249422911. The next prime is 249422947. The reversal of 249422921 is 129224942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249422921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (249422911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11337395 + ... + 11337416.

It is an arithmetic number, because the mean of its divisors is an integer number (68024436).

Almost surely, 2^249422921 is an apocalyptic number.

It is an amenable number.

249422921 is a deficient number, since it is larger than the sum of its proper divisors (22674823).

249422921 is a wasteful number, since it uses less digits than its factorization.

249422921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22674822.

The product of its digits is 20736, while the sum is 35.

The square root of 249422921 is about 15793.1289173488. The cubic root of 249422921 is about 629.4754355228.

The spelling of 249422921 in words is "two hundred forty-nine million, four hundred twenty-two thousand, nine hundred twenty-one".