1221110202120 has 32 divisors (see below), whose sum is σ = 3663330606720. Its totient is φ = 325629387200.

The previous prime is 1221110202071. The next prime is 1221110202127. The reversal of 1221110202120 is 212020111221.

It is a super-2 number, since 2×1221110202120² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1221110202120.

It is not an unprimeable number, because it can be changed into a prime (1221110202127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5087959056 + ... + 5087959295.

It is an arithmetic number, because the mean of its divisors is an integer number (114479081460).

Almost surely, 2^{1221110202120} is an apocalyptic number.

1221110202120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221110202120 is an abundant number, since it is smaller than the sum of its proper divisors (2442220404600).

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

1221110202120 is a wasteful number, since it uses less digits than its factorization.

1221110202120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10175918365 (or 10175918361 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221110202120 its reverse (212020111221), we get a palindrome (1433130313341).

The spelling of 1221110202120 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, two hundred two thousand, one hundred twenty".