221212321130444 has 48 divisors (see below), whose sum is σ = 444151731319296. Its totient is φ = 94435262812800.

The previous prime is 221212321130443. The next prime is 221212321130473. The reversal of 221212321130444 is 444031123212122.

It is a self number, because there is not a number n which added to its sum of digits gives 221212321130444.

It is not an unprimeable number, because it can be changed into a prime (221212321130443) 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, 71619464 + ... + 74644304.

It is an arithmetic number, because the mean of its divisors is an integer number (9253161069152).

Almost surely, 2^{221212321130444} is an apocalyptic number.

It is an amenable number.

221212321130444 is an abundant number, since it is smaller than the sum of its proper divisors (222939410188852).

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

221212321130444 is a wasteful number, since it uses less digits than its factorization.

221212321130444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3035046 (or 3035044 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 221212321130444 its reverse (444031123212122), we get a palindrome (665243444342566).

The spelling of 221212321130444 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred twenty-one million, one hundred thirty thousand, four hundred forty-four".