2521378447 has 24 divisors (see below), whose sum is σ = 2963908800. Its totient is φ = 2138552640.

The previous prime is 2521378429. The next prime is 2521378469. The reversal of 2521378447 is 7448731252.

2521378447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2521378447 - 2⁷ = 2521378319 is a prime.

It is a super-2 number, since 2×2521378447² = 12714698545992263618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521378417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2678997 + ... + 2679937.

It is an arithmetic number, because the mean of its divisors is an integer number (123496200).

Almost surely, 2^2521378447 is an apocalyptic number.

2521378447 is a deficient number, since it is larger than the sum of its proper divisors (442530353).

2521378447 is a wasteful number, since it uses less digits than its factorization.

2521378447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471 (or 1464 counting only the distinct ones).

The product of its digits is 376320, while the sum is 43.

The square root of 2521378447 is about 50213.3293757743. The cubic root of 2521378447 is about 1361.0665017821.

The spelling of 2521378447 in words is "two billion, five hundred twenty-one million, three hundred seventy-eight thousand, four hundred forty-seven".