1220120021200 has 30 divisors (see below), whose sum is σ = 2931338351894. Its totient is φ = 488048008320.

The previous prime is 1220120021117. The next prime is 1220120021207. The reversal of 1220120021200 is 21200210221.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 332024878656 + 888095142544 = 576216^2 + 942388^2 .

It is a super-2 number, since 2×1220120021200² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120021207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1525149627 + ... + 1525150426.

Almost surely, 2^{1220120021200} is an apocalyptic number.

1220120021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220120021200 is an abundant number, since it is smaller than the sum of its proper divisors (1711218330694).

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

1220120021200 is a wasteful number, since it uses less digits than its factorization.

1220120021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050300071 (or 3050300060 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1220120021200 its reverse (21200210221), we get a palindrome (1241320231421).

The spelling of 1220120021200 in words is "one trillion, two hundred twenty billion, one hundred twenty million, twenty-one thousand, two hundred".