221312303212 has 48 divisors (see below), whose sum is σ = 520006540032. Its totient is φ = 79592834880.

The previous prime is 221312303171. The next prime is 221312303213. The reversal of 221312303212 is 212303213122.

221312303212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (221312303213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27632398 + ... + 27640405.

It is an arithmetic number, because the mean of its divisors is an integer number (10833469584).

Almost surely, 2^221312303212 is an apocalyptic number.

221312303212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221312303212 is an abundant number, since it is smaller than the sum of its proper divisors (298694236820).

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

221312303212 is a wasteful number, since it uses less digits than its factorization.

221312303212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55272838 (or 55272836 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221312303212 its reverse (212303213122), we get a palindrome (433615516334).

The spelling of 221312303212 in words is "two hundred twenty-one billion, three hundred twelve million, three hundred three thousand, two hundred twelve".