1221222002120 has 32 divisors (see below), whose sum is σ = 2909381830200. Its totient is φ = 459754165248.

The previous prime is 1221222002113. The next prime is 1221222002129. The reversal of 1221222002120 is 212002221221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1219535914276 + 1686087844 = 1104326^2 + 41062^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (1221222002129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897956675 + ... + 897958034.

Almost surely, 2^{1221222002120} is an apocalyptic number.

1221222002120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221222002120 is an abundant number, since it is smaller than the sum of its proper divisors (1688159828080).

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

1221222002120 is a wasteful number, since it uses less digits than its factorization.

1221222002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795914737 (or 1795914733 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221222002120 its reverse (212002221221), we get a palindrome (1433224223341).

The spelling of 1221222002120 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two thousand, one hundred twenty".