221021312133 has 8 divisors (see below), whose sum is σ = 294697893568. Its totient is φ = 147346136064.

The previous prime is 221021312087. The next prime is 221021312177. The reversal of 221021312133 is 331213120122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221021312133 - 2¹⁶ = 221021246597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021316133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97560 + ... + 671982.

It is an arithmetic number, because the mean of its divisors is an integer number (36837236696).

Almost surely, 2^221021312133 is an apocalyptic number.

It is an amenable number.

221021312133 is a deficient number, since it is larger than the sum of its proper divisors (73676581435).

221021312133 is a wasteful number, since it uses less digits than its factorization.

221021312133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702683.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221021312133 its reverse (331213120122), we get a palindrome (552234432255).

The spelling of 221021312133 in words is "two hundred twenty-one billion, twenty-one million, three hundred twelve thousand, one hundred thirty-three".