21155143645147 has 8 divisors (see below), whose sum is σ = 21525346451360. Its totient is φ = 20785695586560.

The previous prime is 21155143645087. The next prime is 21155143645169. The reversal of 21155143645147 is 74154634155112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21155143645147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21155143645147.

It is not an unprimeable number, because it can be changed into a prime (21155143643147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188630358 + ... + 188742475.

It is an arithmetic number, because the mean of its divisors is an integer number (2690668306420).

Almost surely, 2^{21155143645147} is an apocalyptic number.

21155143645147 is a deficient number, since it is larger than the sum of its proper divisors (370202806213).

21155143645147 is an equidigital number, since it uses as much as digits as its factorization.

21155143645147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377373813.

The product of its digits is 2016000, while the sum is 49.

The spelling of 21155143645147 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-three million, six hundred forty-five thousand, one hundred forty-seven".