2521378542 has 32 divisors (see below), whose sum is σ = 5404234752. Its totient is φ = 782188704.

The previous prime is 2521378537. The next prime is 2521378549. The reversal of 2521378542 is 2458731252.

It is a self number, because there is not a number n which added to its sum of digits gives 2521378542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521378549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241798 + ... + 252009.

It is an arithmetic number, because the mean of its divisors is an integer number (168882336).

Almost surely, 2^2521378542 is an apocalyptic number.

2521378542 is an abundant number, since it is smaller than the sum of its proper divisors (2882856210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2521378542 is a wasteful number, since it uses less digits than its factorization.

2521378542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493872.

The product of its digits is 134400, while the sum is 39.

The square root of 2521378542 is about 50213.3303217383. The cubic root of 2521378542 is about 1361.0665188761.

The spelling of 2521378542 in words is "two billion, five hundred twenty-one million, three hundred seventy-eight thousand, five hundred forty-two".