1221120221200 has 60 divisors (see below), whose sum is σ = 3200445100368. Its totient is φ = 444043715200.

The previous prime is 1221120221059. The next prime is 1221120221221. The reversal of 1221120221200 is 21220211221.

It is a happy number.

It is a super-2 number, since 2×1221120221200² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138759262 + ... + 138768061.

Almost surely, 2^{1221120221200} is an apocalyptic number.

1221120221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221120221200 is an abundant number, since it is smaller than the sum of its proper divisors (1979324879168).

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

1221120221200 is a wasteful number, since it uses less digits than its factorization.

1221120221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277527352 (or 277527341 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221120221200 its reverse (21220211221), we get a palindrome (1242340432421).

The spelling of 1221120221200 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, two hundred".