21155143154321 has 8 divisors (see below), whose sum is σ = 23337645156000. Its totient is φ = 19015859014240.

The previous prime is 21155143154291. The next prime is 21155143154339. The reversal of 21155143154321 is 12345134155112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21155143154321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21155143154221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10804464371 + ... + 10804466328.

It is an arithmetic number, because the mean of its divisors is an integer number (2917205644500).

Almost surely, 2^{21155143154321} is an apocalyptic number.

It is an amenable number.

21155143154321 is a deficient number, since it is larger than the sum of its proper divisors (2182502001679).

21155143154321 is a wasteful number, since it uses less digits than its factorization.

21155143154321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21608930799.

The product of its digits is 72000, while the sum is 38.

The spelling of 21155143154321 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-three million, one hundred fifty-four thousand, three hundred twenty-one".