2478333921 has 16 divisors (see below), whose sum is σ = 3778690944. Its totient is φ = 1415372544.

The previous prime is 2478333917. The next prime is 2478333931. The reversal of 2478333921 is 1293338742.

It is not a de Polignac number, because 2478333921 - 2² = 2478333917 is a prime.

It is a super-2 number, since 2×2478333921² = 12284278047958468482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2478333911) 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, 4111 + ... + 70523.

It is an arithmetic number, because the mean of its divisors is an integer number (236168184).

Almost surely, 2^2478333921 is an apocalyptic number.

2478333921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2478333921 is a deficient number, since it is larger than the sum of its proper divisors (1300357023).

2478333921 is a wasteful number, since it uses less digits than its factorization.

2478333921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68200.

The product of its digits is 217728, while the sum is 42.

The square root of 2478333921 is about 49782.8677458420. The cubic root of 2478333921 is about 1353.2767081322.

The spelling of 2478333921 in words is "two billion, four hundred seventy-eight million, three hundred thirty-three thousand, nine hundred twenty-one".