1220543423450 has 192 divisors, whose sum is σ = 2627944300800. Its totient is φ = 418008729600.

The previous prime is 1220543423419. The next prime is 1220543423461. The reversal of 1220543423450 is 543243450221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220543423450.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 113207060 + ... + 113217840.

It is an arithmetic number, because the mean of its divisors is an integer number (13687209900).

Almost surely, 2^{1220543423450} is an apocalyptic number.

1220543423450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220543423450 is an abundant number, since it is smaller than the sum of its proper divisors (1407400877350).

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

1220543423450 is a wasteful number, since it uses less digits than its factorization.

1220543423450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11017 (or 11012 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 1220543423450 its reverse (543243450221), we get a palindrome (1763786873671).

The spelling of 1220543423450 in words is "one trillion, two hundred twenty billion, five hundred forty-three million, four hundred twenty-three thousand, four hundred fifty".