1220550440420 has 12 divisors (see below), whose sum is σ = 2563155924924. Its totient is φ = 488220176160.

The previous prime is 1220550440399. The next prime is 1220550440437. The reversal of 1220550440420 is 240440550221.

It can be written as a sum of positive squares in 2 ways, for example, as 483792584704 + 736757855716 = 695552^2 + 858346^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30513760991 + ... + 30513761030.

It is an arithmetic number, because the mean of its divisors is an integer number (213596327077).

Almost surely, 2^{1220550440420} is an apocalyptic number.

1220550440420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220550440420 is an abundant number, since it is smaller than the sum of its proper divisors (1342605484504).

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

1220550440420 is a wasteful number, since it uses less digits than its factorization.

1220550440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61027522030 (or 61027522028 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 1220550440420 its reverse (240440550221), we get a palindrome (1460990990641).

The spelling of 1220550440420 in words is "one trillion, two hundred twenty billion, five hundred fifty million, four hundred forty thousand, four hundred twenty".