221212303442220 has 48 divisors (see below), whose sum is σ = 619399728380160. Its totient is φ = 58989444847296.

The previous prime is 221212303442203. The next prime is 221212303442303. The reversal of 221212303442220 is 22244303212122.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 8584912 + ... + 22718391.

It is an arithmetic number, because the mean of its divisors is an integer number (12904161007920).

Almost surely, 2^{221212303442220} is an apocalyptic number.

221212303442220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212303442220 is an abundant number, since it is smaller than the sum of its proper divisors (398187424937940).

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

221212303442220 is a wasteful number, since it uses less digits than its factorization.

221212303442220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31421094 (or 31421092 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 221212303442220 its reverse (22244303212122), we get a palindrome (243456606654342).

The spelling of 221212303442220 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred three million, four hundred forty-two thousand, two hundred twenty".