21078469567578 has 16 divisors (see below), whose sum is σ = 42159994372800. Its totient is φ = 7025647316256.

The previous prime is 21078469567577. The next prime is 21078469567583. The reversal of 21078469567578 is 87576596487012.

It is a super-2 number, since 2×21078469567578² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21078469567577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127211875 + ... + 127377462.

It is an arithmetic number, because the mean of its divisors is an integer number (2634999648300).

Almost surely, 2^{21078469567578} is an apocalyptic number.

21078469567578 is an abundant number, since it is smaller than the sum of its proper divisors (21081524805222).

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

21078469567578 is a wasteful number, since it uses less digits than its factorization.

21078469567578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254603141.

The product of its (nonzero) digits is 1422489600, while the sum is 75.

The spelling of 21078469567578 in words is "twenty-one trillion, seventy-eight billion, four hundred sixty-nine million, five hundred sixty-seven thousand, five hundred seventy-eight".