2181143520031 has 4 divisors (see below), whose sum is σ = 2492735451472. Its totient is φ = 1869551588592.

The previous prime is 2181143520019. The next prime is 2181143520041. The reversal of 2181143520031 is 1300253411812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2181143520031 - 2¹³ = 2181143511839 is a prime.

It is a super-2 number, since 2×2181143520031² (a number of 25 digits) contains 22 as substring.

It is the 1476870-th Hogben number.

It is a junction number, because it is equal to n+sod(n) for n = 2181143519975 and 2181143520002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181143520041) by changing a digit.

It is a nontrivial repunit in base 1476869.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155795965710 + ... + 155795965723.

It is an arithmetic number, because the mean of its divisors is an integer number (623183862868).

Almost surely, 2^{2181143520031} is an apocalyptic number.

2181143520031 is a deficient number, since it is larger than the sum of its proper divisors (311591931441).

2181143520031 is an equidigital number, since it uses as much as digits as its factorization.

2181143520031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311591931440.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 2181143520031 its reverse (1300253411812), we get a palindrome (3481396931843).

The spelling of 2181143520031 in words is "two trillion, one hundred eighty-one billion, one hundred forty-three million, five hundred twenty thousand, thirty-one".