221222203311220 has 48 divisors (see below), whose sum is σ = 465485982670800. Its totient is φ = 88313770926080.

The previous prime is 221222203311199. The next prime is 221222203311283. The reversal of 221222203311220 is 22113302222122.

It can be written as a sum of positive squares in 8 ways, for example, as 10293869060836 + 210928334250384 = 3208406^2 + 14523372^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1084485396 + ... + 1084689364.

It is an arithmetic number, because the mean of its divisors is an integer number (9697624638975).

Almost surely, 2^{221222203311220} is an apocalyptic number.

221222203311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222203311220 is an abundant number, since it is smaller than the sum of its proper divisors (244263779359580).

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

221222203311220 is a wasteful number, since it uses less digits than its factorization.

221222203311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311028 (or 311026 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 221222203311220 its reverse (22113302222122), we get a palindrome (243335505533342).

The spelling of 221222203311220 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred three million, three hundred eleven thousand, two hundred twenty".