1200200011220 has 144 divisors (see below), whose sum is σ = 3155277080592. Its totient is φ = 380942069760.

The previous prime is 1200200011211. The next prime is 1200200011229. The reversal of 1200200011220 is 221100020021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1200200011211) and next prime (1200200011229).

It can be written as a sum of positive squares in 8 ways, for example, as 76638170896 + 1123561840324 = 276836^2 + 1059982^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200200011229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 425762 + ... + 1606758.

It is an arithmetic number, because the mean of its divisors is an integer number (21911646393).

Almost surely, 2^{1200200011220} is an apocalyptic number.

1200200011220 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 1200200011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1577638540296).

1200200011220 is an abundant number, since it is smaller than the sum of its proper divisors (1955077069372).

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

1200200011220 is a wasteful number, since it uses less digits than its factorization.

1200200011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181098 (or 1181089 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1200200011220 its reverse (221100020021), we get a palindrome (1421300031241).

The spelling of 1200200011220 in words is "one trillion, two hundred billion, two hundred million, eleven thousand, two hundred twenty".