1220543442000 has 240 divisors, whose sum is σ = 4264719683328. Its totient is φ = 325343251200.

The previous prime is 1220543441983. The next prime is 1220543442023. The reversal of 1220543442000 is 2443450221.

1220543442000 is a `hidden beast` number, since 1 + 2 + 20 + 5 + 434 + 4 + 200 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47921269 + ... + 47946731.

Almost surely, 2^{1220543442000} is an apocalyptic number.

1220543442000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220543442000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2132359841664).

1220543442000 is an abundant number, since it is smaller than the sum of its proper divisors (3044176241328).

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

1220543442000 is a wasteful number, since it uses less digits than its factorization.

1220543442000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28155 (or 28136 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 1220543442000 its reverse (2443450221), we get a palindrome (1222986892221).

The spelling of 1220543442000 in words is "one trillion, two hundred twenty billion, five hundred forty-three million, four hundred forty-two thousand".