21297799545985 has 16 divisors (see below), whose sum is σ = 25593580350720. Its totient is φ = 17014094838720.

The previous prime is 21297799545959. The next prime is 21297799545991. The reversal of 21297799545985 is 58954599779212.

It is not a de Polignac number, because 21297799545985 - 2²¹ = 21297797448833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21297799545899 and 21297799545908.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74002996 + ... + 74290234.

It is an arithmetic number, because the mean of its divisors is an integer number (1599598771920).

Almost surely, 2^{21297799545985} is an apocalyptic number.

It is an amenable number.

21297799545985 is a deficient number, since it is larger than the sum of its proper divisors (4295780804735).

21297799545985 is a wasteful number, since it uses less digits than its factorization.

21297799545985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308208.

The product of its digits is 5143824000, while the sum is 82.

The spelling of 21297799545985 in words is "twenty-one trillion, two hundred ninety-seven billion, seven hundred ninety-nine million, five hundred forty-five thousand, nine hundred eighty-five".