2143211531 has 4 divisors (see below), whose sum is σ = 2156360232. Its totient is φ = 2130062832.

The previous prime is 2143211513. The next prime is 2143211561. The reversal of 2143211531 is 1351123412.

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 2143211531 - 2²⁶ = 2076102667 is a prime.

It is a super-2 number, since 2×2143211531² = 9186711333222727922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2143211497 and 2143211506.

It is not an unprimeable number, because it can be changed into a prime (2143211561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6574106 + ... + 6574431.

It is an arithmetic number, because the mean of its divisors is an integer number (539090058).

Almost surely, 2^2143211531 is an apocalyptic number.

2143211531 is a deficient number, since it is larger than the sum of its proper divisors (13148701).

2143211531 is a wasteful number, since it uses less digits than its factorization.

2143211531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13148700.

The product of its digits is 720, while the sum is 23.

The square root of 2143211531 is about 46294.8326598120. The cubic root of 2143211531 is about 1289.3030570209.

Adding to 2143211531 its reverse (1351123412), we get a palindrome (3494334943).

The spelling of 2143211531 in words is "two billion, one hundred forty-three million, two hundred eleven thousand, five hundred thirty-one".