21660561143162 has 16 divisors (see below), whose sum is σ = 33182616563712. Its totient is φ = 10599695626800.

The previous prime is 21660561143129. The next prime is 21660561143219. The reversal of 21660561143162 is 26134116506612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5001287 + ... + 8266437.

It is an arithmetic number, because the mean of its divisors is an integer number (2073913535232).

Almost surely, 2^{21660561143162} is an apocalyptic number.

21660561143162 is a deficient number, since it is larger than the sum of its proper divisors (11522055420550).

21660561143162 is a wasteful number, since it uses less digits than its factorization.

21660561143162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335773.

The product of its (nonzero) digits is 311040, while the sum is 44.

Adding to 21660561143162 its reverse (26134116506612), we get a palindrome (47794677649774).

The spelling of 21660561143162 in words is "twenty-one trillion, six hundred sixty billion, five hundred sixty-one million, one hundred forty-three thousand, one hundred sixty-two".