21354617343170 has 16 divisors (see below), whose sum is σ = 38653050389760. Its totient is φ = 8494127121264.

The previous prime is 21354617343151. The next prime is 21354617343193. The reversal of 21354617343170 is 7134371645312.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5964975122 + ... + 5964978701.

It is an arithmetic number, because the mean of its divisors is an integer number (2415815649360).

Almost surely, 2^{21354617343170} is an apocalyptic number.

21354617343170 is a deficient number, since it is larger than the sum of its proper divisors (17298433046590).

21354617343170 is a wasteful number, since it uses less digits than its factorization.

21354617343170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11929954009.

The product of its (nonzero) digits is 1270080, while the sum is 47.

Adding to 21354617343170 its reverse (7134371645312), we get a palindrome (28488988988482).

The spelling of 21354617343170 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred seventeen million, three hundred forty-three thousand, one hundred seventy".