213232142440 has 32 divisors (see below), whose sum is σ = 479813249160. Its totient is φ = 85285580800.

The previous prime is 213232142437. The next prime is 213232142447. The reversal of 213232142440 is 44241232312.

It can be written as a sum of positive squares in 4 ways, for example, as 119800438884 + 93431703556 = 346122^2 + 305666^2 .

It is a junction number, because it is equal to n+sod(n) for n = 213232142399 and 213232142408.

It is not an unprimeable number, because it can be changed into a prime (213232142447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260280 + ... + 703000.

Almost surely, 2^213232142440 is an apocalyptic number.

213232142440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213232142440 is an abundant number, since it is smaller than the sum of its proper divisors (266581106720).

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

213232142440 is a wasteful number, since it uses less digits than its factorization.

213232142440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454773 (or 454769 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 213232142440 its reverse (44241232312), we get a palindrome (257473374752).

The spelling of 213232142440 in words is "two hundred thirteen billion, two hundred thirty-two million, one hundred forty-two thousand, four hundred forty".