221236240530 has 32 divisors (see below), whose sum is σ = 531061509888. Its totient is φ = 58985827200.

The previous prime is 221236240513. The next prime is 221236240531. The reversal of 221236240530 is 35042632122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (221236240531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484426 + ... + 822885.

It is an arithmetic number, because the mean of its divisors is an integer number (16595672184).

Almost surely, 2^221236240530 is an apocalyptic number.

221236240530 is an abundant number, since it is smaller than the sum of its proper divisors (309825269358).

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

221236240530 is a wasteful number, since it uses less digits than its factorization.

221236240530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312962.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 221236240530 its reverse (35042632122), we get a palindrome (256278872652).

The spelling of 221236240530 in words is "two hundred twenty-one billion, two hundred thirty-six million, two hundred forty thousand, five hundred thirty".