21491176892064 has 96 divisors (see below), whose sum is σ = 61605910328256. Its totient is φ = 6505811742720.

The previous prime is 21491176892063. The next prime is 21491176892113. The reversal of 21491176892064 is 46029867119412.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21491176891989 and 21491176892007.

It is not an unprimeable number, because it can be changed into a prime (21491176892063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9383587 + ... + 11447010.

It is an arithmetic number, because the mean of its divisors is an integer number (641728232586).

Almost surely, 2^{21491176892064} is an apocalyptic number.

21491176892064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21491176892064 is an abundant number, since it is smaller than the sum of its proper divisors (40114733436192).

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

21491176892064 is a wasteful number, since it uses less digits than its factorization.

21491176892064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20831598 (or 20831590 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 60.

The spelling of 21491176892064 in words is "twenty-one trillion, four hundred ninety-one billion, one hundred seventy-six million, eight hundred ninety-two thousand, sixty-four".