221412564220 has 24 divisors (see below), whose sum is σ = 471515210208. Its totient is φ = 87317630400.

The previous prime is 221412564167. The next prime is 221412564299. The reversal of 221412564220 is 22465214122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77960751 + ... + 77963590.

It is an arithmetic number, because the mean of its divisors is an integer number (19646467092).

Almost surely, 2^221412564220 is an apocalyptic number.

221412564220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221412564220 is an abundant number, since it is smaller than the sum of its proper divisors (250102645988).

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

221412564220 is a wasteful number, since it uses less digits than its factorization.

221412564220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155924421 (or 155924419 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 221412564220 its reverse (22465214122), we get a palindrome (243877778342).

The spelling of 221412564220 in words is "two hundred twenty-one billion, four hundred twelve million, five hundred sixty-four thousand, two hundred twenty".