221221240134 has 16 divisors (see below), whose sum is σ = 442635967488. Its totient is φ = 73708165512.

The previous prime is 221221240133. The next prime is 221221240151. The reversal of 221221240134 is 431042122122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221240133) 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 7 ways as a sum of consecutive naturals, for example, 8047102 + ... + 8074545.

It is an arithmetic number, because the mean of its divisors is an integer number (27664747968).

Almost surely, 2^221221240134 is an apocalyptic number.

221221240134 is an abundant number, since it is smaller than the sum of its proper divisors (221414727354).

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

221221240134 is a wasteful number, since it uses less digits than its factorization.

221221240134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16123939.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 221221240134 its reverse (431042122122), we get a palindrome (652263362256).

The spelling of 221221240134 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred forty thousand, one hundred thirty-four".