1220218334550 has 48 divisors (see below), whose sum is σ = 3362379414480. Its totient is φ = 325391555520.

The previous prime is 1220218334521. The next prime is 1220218334557. The reversal of 1220218334550 is 554338120221.

1220218334550 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 21 + 83 + 3 + 4 + 550 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220218334557) 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, 451931367 + ... + 451934066.

It is an arithmetic number, because the mean of its divisors is an integer number (70049571135).

Almost surely, 2^{1220218334550} is an apocalyptic number.

1220218334550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220218334550 is an abundant number, since it is smaller than the sum of its proper divisors (2142161079930).

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

1220218334550 is a wasteful number, since it uses less digits than its factorization.

1220218334550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903865454 (or 903865443 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 1220218334550 in words is "one trillion, two hundred twenty billion, two hundred eighteen million, three hundred thirty-four thousand, five hundred fifty".