213243120040 has 16 divisors (see below), whose sum is σ = 479797020180. Its totient is φ = 85297248000.

The previous prime is 213243120029. The next prime is 213243120047. The reversal of 213243120040 is 40021342312.

It can be written as a sum of positive squares in 2 ways, for example, as 213201980644 + 41139396 = 461738^2 + 6414^2 .

It is a junction number, because it is equal to n+sod(n) for n = 213243119993 and 213243120020.

It is not an unprimeable number, because it can be changed into a prime (213243120047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2665538961 + ... + 2665539040.

Almost surely, 2^213243120040 is an apocalyptic number.

213243120040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213243120040 is an abundant number, since it is smaller than the sum of its proper divisors (266553900140).

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

213243120040 is a wasteful number, since it uses less digits than its factorization.

213243120040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5331078012 (or 5331078008 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 213243120040 its reverse (40021342312), we get a palindrome (253264462352).

The spelling of 213243120040 in words is "two hundred thirteen billion, two hundred forty-three million, one hundred twenty thousand, forty".