249547366921 has 4 divisors (see below), whose sum is σ = 249556374144. Its totient is φ = 249538359700.

The previous prime is 249547366903. The next prime is 249547366927. The reversal of 249547366921 is 129663745942.

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 not a de Polignac number, because 249547366921 - 2¹³ = 249547358729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249547366927) 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, 4461925 + ... + 4517506.

It is an arithmetic number, because the mean of its divisors is an integer number (62389093536).

Almost surely, 2^249547366921 is an apocalyptic number.

It is an amenable number.

249547366921 is a deficient number, since it is larger than the sum of its proper divisors (9007223).

249547366921 is an equidigital number, since it uses as much as digits as its factorization.

249547366921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9007222.

The product of its digits is 19595520, while the sum is 58.

The spelling of 249547366921 in words is "two hundred forty-nine billion, five hundred forty-seven million, three hundred sixty-six thousand, nine hundred twenty-one".