2175631213 has 12 divisors (see below), whose sum is σ = 2531885052. Its totient is φ = 1864054080.

The previous prime is 2175631153. The next prime is 2175631231. The reversal of 2175631213 is 3121365712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1586986569 + 588644644 = 39837^2 + 24262^2 .

It is not a de Polignac number, because 2175631213 - 2¹⁷ = 2175500141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2175631013) 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 11 ways as a sum of consecutive naturals, for example, 132223 + ... + 147763.

It is an arithmetic number, because the mean of its divisors is an integer number (210990421).

Almost surely, 2^2175631213 is an apocalyptic number.

It is an amenable number.

2175631213 is a deficient number, since it is larger than the sum of its proper divisors (356253839).

2175631213 is a wasteful number, since it uses less digits than its factorization.

2175631213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18412 (or 18405 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 2175631213 is about 46643.6620882194. The cubic root of 2175631213 is about 1295.7715100810.

Adding to 2175631213 its reverse (3121365712), we get a palindrome (5296996925).

The spelling of 2175631213 in words is "two billion, one hundred seventy-five million, six hundred thirty-one thousand, two hundred thirteen".