21771166704045 has 64 divisors (see below), whose sum is σ = 38719932346368. Its totient is φ = 10355921888000.

The previous prime is 21771166704037. The next prime is 21771166704083. The reversal of 21771166704045 is 54040766117712.

It is not a de Polignac number, because 21771166704045 - 2³ = 21771166704037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 163736140 + ... + 163869050.

It is an arithmetic number, because the mean of its divisors is an integer number (604998942912).

Almost surely, 2^{21771166704045} is an apocalyptic number.

It is an amenable number.

21771166704045 is a deficient number, since it is larger than the sum of its proper divisors (16948765642323).

21771166704045 is a wasteful number, since it uses less digits than its factorization.

21771166704045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151714.

The product of its (nonzero) digits is 1975680, while the sum is 51.

The spelling of 21771166704045 in words is "twenty-one trillion, seven hundred seventy-one billion, one hundred sixty-six million, seven hundred four thousand, forty-five".