21443511342166 has 8 divisors (see below), whose sum is σ = 33858175803480. Its totient is φ = 10157452741008.

The previous prime is 21443511342151. The next prime is 21443511342167. The reversal of 21443511342166 is 66124311534412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443511342167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282151464991 + ... + 282151465066.

It is an arithmetic number, because the mean of its divisors is an integer number (4232271975435).

Almost surely, 2^{21443511342166} is an apocalyptic number.

21443511342166 is a deficient number, since it is larger than the sum of its proper divisors (12414664461314).

21443511342166 is a wasteful number, since it uses less digits than its factorization.

21443511342166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564302930078.

The product of its digits is 414720, while the sum is 43.

Adding to 21443511342166 its reverse (66124311534412), we get a palindrome (87567822876578).

The spelling of 21443511342166 in words is "twenty-one trillion, four hundred forty-three billion, five hundred eleven million, three hundred forty-two thousand, one hundred sixty-six".