21202160245566 has 32 divisors (see below), whose sum is σ = 45439640402688. Its totient is φ = 6571517654400.

The previous prime is 21202160245559. The next prime is 21202160245571. The reversal of 21202160245566 is 66554206120212.

It is a happy number.

It is a super-3 number, since 3×21202160245566³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1252186210 + ... + 1252203141.

It is an arithmetic number, because the mean of its divisors is an integer number (1419988762584).

Almost surely, 2^{21202160245566} is an apocalyptic number.

21202160245566 is an abundant number, since it is smaller than the sum of its proper divisors (24237480157122).

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

21202160245566 is a wasteful number, since it uses less digits than its factorization.

21202160245566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504389456.

The product of its (nonzero) digits is 345600, while the sum is 42.

Adding to 21202160245566 its reverse (66554206120212), we get a palindrome (87756366365778).

The spelling of 21202160245566 in words is "twenty-one trillion, two hundred two billion, one hundred sixty million, two hundred forty-five thousand, five hundred sixty-six".