221142231044 has 144 divisors (see below), whose sum is σ = 487633208832. Its totient is φ = 87154034688.

The previous prime is 221142231031. The next prime is 221142231049. The reversal of 221142231044 is 440132241122.

It is a super-2 number, since 2×221142231044² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221142231049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161771249 + ... + 161772615.

It is an arithmetic number, because the mean of its divisors is an integer number (3386341728).

Almost surely, 2^221142231044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221142231044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243816604416).

221142231044 is an abundant number, since it is smaller than the sum of its proper divisors (266490977788).

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

221142231044 is a wasteful number, since it uses less digits than its factorization.

221142231044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2482 (or 2473 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 221142231044 its reverse (440132241122), we get a palindrome (661274472166).

The spelling of 221142231044 in words is "two hundred twenty-one billion, one hundred forty-two million, two hundred thirty-one thousand, forty-four".