19449221249 has 4 divisors (see below), whose sum is σ = 19449507120. Its totient is φ = 19448935380.

The previous prime is 19449221243. The next prime is 19449221251. The reversal of 19449221249 is 94212294491.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 19449221249 - 2³² = 15154253953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19449221243) 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, 24482 + ... + 198740.

It is an arithmetic number, because the mean of its divisors is an integer number (4862376780).

Almost surely, 2^19449221249 is an apocalyptic number.

It is an amenable number.

19449221249 is a deficient number, since it is larger than the sum of its proper divisors (285871).

19449221249 is a wasteful number, since it uses less digits than its factorization.

19449221249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285870.

The product of its digits is 373248, while the sum is 47.

The spelling of 19449221249 in words is "nineteen billion, four hundred forty-nine million, two hundred twenty-one thousand, two hundred forty-nine".