221323121220 has 48 divisors (see below), whose sum is σ = 622116085248. Its totient is φ = 58789847040.

The previous prime is 221323121219. The next prime is 221323121221. The reversal of 221323121220 is 22121323122.

It is an interprime number because it is at equal distance from previous prime (221323121219) and next prime (221323121221).

It is not an unprimeable number, because it can be changed into a prime (221323121221) 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, 7161076 + ... + 7191915.

It is an arithmetic number, because the mean of its divisors is an integer number (12960751776).

Almost surely, 2^221323121220 is an apocalyptic number.

221323121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221323121220 is an abundant number, since it is smaller than the sum of its proper divisors (400792964028).

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

221323121220 is a wasteful number, since it uses less digits than its factorization.

221323121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14353260 (or 14353258 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221323121220 its reverse (22121323122), we get a palindrome (243444444342).

The spelling of 221323121220 in words is "two hundred twenty-one billion, three hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty".