221311223016 has 96 divisors (see below), whose sum is σ = 599281812000. Its totient is φ = 68076433152.

The previous prime is 221311223011. The next prime is 221311223017. The reversal of 221311223016 is 610322113122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (221311223011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21974430 + ... + 21984498.

It is an arithmetic number, because the mean of its divisors is an integer number (6242518875).

Almost surely, 2^221311223016 is an apocalyptic number.

221311223016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221311223016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299640906000).

221311223016 is an abundant number, since it is smaller than the sum of its proper divisors (377970588984).

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

221311223016 is a wasteful number, since it uses less digits than its factorization.

221311223016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15523 (or 15506 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 221311223016 its reverse (610322113122), we get a palindrome (831633336138).

The spelling of 221311223016 in words is "two hundred twenty-one billion, three hundred eleven million, two hundred twenty-three thousand, sixteen".