215221225232 has 20 divisors (see below), whose sum is σ = 449067364620. Its totient is φ = 99332873088.

The previous prime is 215221225223. The next prime is 215221225237. The reversal of 215221225232 is 232522122512.

It can be written as a sum of positive squares in 2 ways, for example, as 27243483136 + 187977742096 = 165056^2 + 433564^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215221225195 and 215221225204.

It is not an unprimeable number, because it can be changed into a prime (215221225237) 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, 517358507 + ... + 517358922.

It is an arithmetic number, because the mean of its divisors is an integer number (22453368231).

Almost surely, 2^215221225232 is an apocalyptic number.

It is an amenable number.

215221225232 is an abundant number, since it is smaller than the sum of its proper divisors (233846139388).

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

215221225232 is a wasteful number, since it uses less digits than its factorization.

215221225232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034717450 (or 1034717444 counting only the distinct ones).

The product of its digits is 9600, while the sum is 29.

Adding to 215221225232 its reverse (232522122512), we get a palindrome (447743347744).

The spelling of 215221225232 in words is "two hundred fifteen billion, two hundred twenty-one million, two hundred twenty-five thousand, two hundred thirty-two".