221231220133 has 16 divisors (see below), whose sum is σ = 275832152064. Its totient is φ = 172380832560.

The previous prime is 221231220131. The next prime is 221231220137. The reversal of 221231220133 is 331022132122.

It is a cyclic number.

It is not a de Polignac number, because 221231220133 - 2¹ = 221231220131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221231220131) 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, 2557516 + ... + 2642602.

It is an arithmetic number, because the mean of its divisors is an integer number (17239509504).

Almost surely, 2^221231220133 is an apocalyptic number.

It is an amenable number.

221231220133 is a deficient number, since it is larger than the sum of its proper divisors (54600931931).

221231220133 is a wasteful number, since it uses less digits than its factorization.

221231220133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118872.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221231220133 its reverse (331022132122), we get a palindrome (552253352255).

The spelling of 221231220133 in words is "two hundred twenty-one billion, two hundred thirty-one million, two hundred twenty thousand, one hundred thirty-three".