221232432320 has 28 divisors (see below), whose sum is σ = 526809730224. Its totient is φ = 88492972800.

The previous prime is 221232432293. The next prime is 221232432371. The reversal of 221232432320 is 23234232122.

It is a happy number.

It is a super-2 number, since 2×221232432320² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221232432320.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345675356 + ... + 345675995.

Almost surely, 2^221232432320 is an apocalyptic number.

221232432320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221232432320 is an abundant number, since it is smaller than the sum of its proper divisors (305577297904).

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

221232432320 is an equidigital number, since it uses as much as digits as its factorization.

221232432320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691351368 (or 691351358 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 221232432320 its reverse (23234232122), we get a palindrome (244466664442).

The spelling of 221232432320 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred thirty-two thousand, three hundred twenty".