2135201231 has 4 divisors (see below), whose sum is σ = 2135581464. Its totient is φ = 2134821000.

The previous prime is 2135201221. The next prime is 2135201279. The reversal of 2135201231 is 1321025312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2135201231 is a prime.

It is a super-2 number, since 2×2135201231² = 9118168593727830722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135201221) 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, 181565 + ... + 192966.

It is an arithmetic number, because the mean of its divisors is an integer number (533895366).

Almost surely, 2^2135201231 is an apocalyptic number.

2135201231 is a deficient number, since it is larger than the sum of its proper divisors (380233).

2135201231 is an equidigital number, since it uses as much as digits as its factorization.

2135201231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380232.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2135201231 is about 46208.2376963242. The cubic root of 2135201231 is about 1287.6947855733.

Adding to 2135201231 its reverse (1321025312), we get a palindrome (3456226543).

The spelling of 2135201231 in words is "two billion, one hundred thirty-five million, two hundred one thousand, two hundred thirty-one".