21104255577178 has 8 divisors (see below), whose sum is σ = 31656407096160. Its totient is φ = 10552119878460.

The previous prime is 21104255577133. The next prime is 21104255577191. The reversal of 21104255577178 is 87177555240112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292113 + ... + 6503371.

It is an arithmetic number, because the mean of its divisors is an integer number (3957050887020).

Almost surely, 2^{21104255577178} is an apocalyptic number.

21104255577178 is a deficient number, since it is larger than the sum of its proper divisors (10552151518982).

21104255577178 is a wasteful number, since it uses less digits than its factorization.

21104255577178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7910132.

The product of its (nonzero) digits is 5488000, while the sum is 55.

The spelling of 21104255577178 in words is "twenty-one trillion, one hundred four billion, two hundred fifty-five million, five hundred seventy-seven thousand, one hundred seventy-eight".