2521386542 has 16 divisors (see below), whose sum is σ = 3800269872. Its totient is φ = 1254644160.

The previous prime is 2521386529. The next prime is 2521386557. The reversal of 2521386542 is 2456831252.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2521386496 and 2521386505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405368 + ... + 411540.

It is an arithmetic number, because the mean of its divisors is an integer number (237516867).

Almost surely, 2^2521386542 is an apocalyptic number.

2521386542 is a deficient number, since it is larger than the sum of its proper divisors (1278883330).

2521386542 is a wasteful number, since it uses less digits than its factorization.

2521386542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7123.

The product of its digits is 115200, while the sum is 38.

The square root of 2521386542 is about 50213.4099817967. The cubic root of 2521386542 is about 1361.0679583692.

The spelling of 2521386542 in words is "two billion, five hundred twenty-one million, three hundred eighty-six thousand, five hundred forty-two".