221201201218 has 8 divisors (see below), whose sum is σ = 337425561360. Its totient is φ = 108726014100.

The previous prime is 221201201201. The next prime is 221201201219. The reversal of 221201201218 is 812102102122.

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

It is a super-2 number, since 2×221201201218² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221201201219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937293108 + ... + 937293343.

It is an arithmetic number, because the mean of its divisors is an integer number (42178195170).

Almost surely, 2^221201201218 is an apocalyptic number.

221201201218 is a deficient number, since it is larger than the sum of its proper divisors (116224360142).

221201201218 is a wasteful number, since it uses less digits than its factorization.

221201201218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874586512.

The product of its (nonzero) digits is 256, while the sum is 22.

The spelling of 221201201218 in words is "two hundred twenty-one billion, two hundred one million, two hundred one thousand, two hundred eighteen".