56821517402 has 32 divisors (see below), whose sum is σ = 93135982464. Its totient is φ = 25840785600.

The previous prime is 56821517393. The next prime is 56821517407. The reversal of 56821517402 is 20471512865.

It is a self number, because there is not a number n which added to its sum of digits gives 56821517402.

It is not an unprimeable number, because it can be changed into a prime (56821517407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3512252 + ... + 3528392.

It is an arithmetic number, because the mean of its divisors is an integer number (2910499452).

Almost surely, 2^56821517402 is an apocalyptic number.

56821517402 is a deficient number, since it is larger than the sum of its proper divisors (36314465062).

56821517402 is a wasteful number, since it uses less digits than its factorization.

56821517402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18134.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 56821517402 in words is "fifty-six billion, eight hundred twenty-one million, five hundred seventeen thousand, four hundred two".