20570216621155 has 8 divisors (see below), whose sum is σ = 24685454680992. Its totient is φ = 16455376806528.

The previous prime is 20570216621153. The next prime is 20570216621161. The reversal of 20570216621155 is 55112661207502.

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

It is a cyclic number.

It is not a de Polignac number, because 20570216621155 - 2¹ = 20570216621153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20570216621153) 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, 99447654 + ... + 99654283.

It is an arithmetic number, because the mean of its divisors is an integer number (3085681835124).

Almost surely, 2^{20570216621155} is an apocalyptic number.

20570216621155 is a deficient number, since it is larger than the sum of its proper divisors (4115238059837).

20570216621155 is a wasteful number, since it uses less digits than its factorization.

20570216621155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199122605.

The product of its (nonzero) digits is 252000, while the sum is 43.

Adding to 20570216621155 its reverse (55112661207502), we get a palindrome (75682877828657).

The spelling of 20570216621155 in words is "twenty trillion, five hundred seventy billion, two hundred sixteen million, six hundred twenty-one thousand, one hundred fifty-five".