221312213309 has 8 divisors (see below), whose sum is σ = 241595650560. Its totient is φ = 201056133600.

The previous prime is 221312213267. The next prime is 221312213323. The reversal of 221312213309 is 903312213122.

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

It is a cyclic number.

It is not a de Polignac number, because 221312213309 - 2¹⁶ = 221312147773 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312213609) 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, 6822464 + ... + 6854825.

It is an arithmetic number, because the mean of its divisors is an integer number (30199456320).

Almost surely, 2^221312213309 is an apocalyptic number.

It is an amenable number.

221312213309 is a deficient number, since it is larger than the sum of its proper divisors (20283437251).

221312213309 is a wasteful number, since it uses less digits than its factorization.

221312213309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13678771.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 221312213309 in words is "two hundred twenty-one billion, three hundred twelve million, two hundred thirteen thousand, three hundred nine".