221251135044 has 24 divisors (see below), whose sum is σ = 516306158368. Its totient is φ = 73742734080.

The previous prime is 221251135013. The next prime is 221251135057. The reversal of 221251135044 is 440531152122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834322 + ... + 1067049.

Almost surely, 2^221251135044 is an apocalyptic number.

It is an amenable number.

221251135044 is an abundant number, since it is smaller than the sum of its proper divisors (295055023324).

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

221251135044 is a wasteful number, since it uses less digits than its factorization.

221251135044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911075 (or 1911073 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 221251135044 its reverse (440531152122), we get a palindrome (661782287166).

The spelling of 221251135044 in words is "two hundred twenty-one billion, two hundred fifty-one million, one hundred thirty-five thousand, forty-four".