21161164543242 has 16 divisors (see below), whose sum is σ = 42405477086880. Its totient is φ = 7039863514352.

The previous prime is 21161164543241. The next prime is 21161164543243. The reversal of 21161164543242 is 24234546116112.

It is an interprime number because it is at equal distance from previous prime (21161164543241) and next prime (21161164543243).

It is a junction number, because it is equal to n+sod(n) for n = 21161164543194 and 21161164543203.

It is not an unprimeable number, because it can be changed into a prime (21161164543241) 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, 3464496708 + ... + 3464502815.

It is an arithmetic number, because the mean of its divisors is an integer number (2650342317930).

Almost surely, 2^{21161164543242} is an apocalyptic number.

21161164543242 is an abundant number, since it is smaller than the sum of its proper divisors (21244312543638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21161164543242 is a wasteful number, since it uses less digits than its factorization.

21161164543242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6929000037.

The product of its digits is 276480, while the sum is 42.

The spelling of 21161164543242 in words is "twenty-one trillion, one hundred sixty-one billion, one hundred sixty-four million, five hundred forty-three thousand, two hundred forty-two".