4249349518921 has 16 divisors (see below), whose sum is σ = 4581132368400. Its totient is φ = 3918269104128.

The previous prime is 4249349518891. The next prime is 4249349518933. The reversal of 4249349518921 is 1298159439424.

It can be written as a sum of positive squares in 8 ways, for example, as 505821086521 + 3743528432400 = 711211^2 + 1934820^2 .

It is a cyclic number.

It is not a de Polignac number, because 4249349518921 - 2⁵ = 4249349518889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4249349518921.

It is not an unprimeable number, because it can be changed into a prime (4249349516921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130295865 + ... + 130328473.

It is an arithmetic number, because the mean of its divisors is an integer number (286320773025).

Almost surely, 2^{4249349518921} is an apocalyptic number.

It is an amenable number.

4249349518921 is a deficient number, since it is larger than the sum of its proper divisors (331782849479).

4249349518921 is a wasteful number, since it uses less digits than its factorization.

4249349518921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43068.

The product of its digits is 22394880, while the sum is 61.

The spelling of 4249349518921 in words is "four trillion, two hundred forty-nine billion, three hundred forty-nine million, five hundred eighteen thousand, nine hundred twenty-one".